Document:

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                                                                   EXHIBIT 10.32

                                PROMISSORY NOTE

$7,500,000.00                                                  February 29, 2000

     FOR VALUE RECEIVED, on or before December 31, 2000 ("Maturity Date") RF
                                                          -------------
MONOLITHICS, INC. ("Borrower"), does hereby unconditionally promise to pay to
                    --------
the order of BANK ONE, TEXAS, NATIONAL ASSOCIATION ("Bank"), at its offices in
                                                     ----
Dallas County, Texas at 1717 Main Street, Dallas, Texas 75201, the principal
amount of SEVEN MILLION FIVE HUNDRED THOUSAND AND NO/100 DOLLARS ($7,500,000.00)
("Total Principal Amount"), or such amount less than the Total Principal Amount
  ----------------------
which is outstanding from time to time if the total amount outstanding hereunder
is less than the Total Principal Amount, in lawful money of the United States of
America, together with interest on such portion of the Total Principal Amount
which has been drawn until paid at the rates per annum provided below.

     1.   Definitions.  For purposes of this promissory note ("Note"), unless
          -----------                                          ----
the context otherwise requires, in addition to the other terms defined herein,
the following terms shall have the definitions assigned to such terms as
follows:

     "Adjusted LIBOR Rate" shall mean with respect to each Interest Period, on
      -------------------
any day thereof an amount equal to the sum of (i) four percent (4.0%), plus,
                                                                       ----
(ii) the quotient of (a) the LIBOR Rate with respect to such Interest Period,

divided by (b) the remainder of 1.0 less the Reserve Requirement in effect on
----------                          ----
such day.  Each determination by Bank of the Adjusted LIBOR Rate shall, in the
absence of manifest error, be conclusive and binding.

     "Business Day" shall mean any day other than a Saturday, Sunday, or any
      ------------
other day on which national banking associations are authorized to be closed.

     "Consequential Loss" shall mean, with respect to Borrower's payment of all
      ------------------
or any portion of the then-outstanding principal amount of any LIBOR Balance on
a day other than the last day of the Interest Period related thereto, any loss,
cost or expense incurred by Bank in redepositing such principal amount,
including the sum of (i) the interest which, but for such payment, Bank would
have earned in respect of such principal amount so paid, for the remainder of
the Interest Period applicable to such sum, reduced, if Bank is able to
redeposit such principal amount so paid for the balance of such Interest Period,
by the interest earned by Bank as a result of so redepositing such principal
amount plus (ii) any expense or penalty incurred by Bank on redepositing such
       ----
principal amount.

     "Contract Rate" shall mean a rate of interest based upon the Adjusted LIBOR
      -------------
Rate or Prime Rate in effect at any time.

     "Dollars" shall mean lawful currency of the United States of America.
      -------

     "Event of Default" shall mean the occurrence of an "Event of Default" as
      ----------------
defined in the Loan Agreement.

PROMISSORY NOTE - Page 1
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     "Excess Interest Amount" shall mean, on any date, the amount by which (i)
      ----------------------
the amount of all interest which would have accrued prior to such date on the
principal of this Note, had the applicable Contract Rate at all times been in
effect without limitation by the Maximum Rate, exceeds (ii) the aggregate amount
                                               -------
of interest accrued on this Note on or prior to such date.

     "Interest Notice" shall mean the notice given by Borrower to Bank of the
      ---------------
Interest Options selected hereunder.  Each Interest Notice shall specify the
Interest Option selected, the amount of the unpaid principal balance of this
Note to bear interest at the rate selected and, if the Adjusted LIBOR Rate is
specified, the length of the applicable Interest Period.  An Interest Notice may
be written or oral (if promptly confirmed thereafter in writing) and Bank is
hereby authorized and directed to honor all telephonic Interest Notices from any
person authorized to request advances hereunder.

     "Interest Option" shall have the meaning assigned to such term in paragraph
      ---------------                                                  ---------
6 hereof.
-

     "Interest Payment Date" shall mean (i) in the case of the Prime Rate
      ---------------------
Balance, on the first day of each month during the term of this Note beginning
on March 1, 2000, and on the Maturity Date, and (ii) in the case of any LIBOR
Balance, the last day of the corresponding Interest Period with respect to such
LIBOR Balance and on the Maturity Date.

     "Interest Period" shall mean, with respect to any LIBOR Balance, a period
      ---------------
commencing: (i) on any date which, pursuant to an Interest Notice, the principal
amount of such LIBOR Balance begins to accrue interest at the Adjusted LIBOR
Rate, or (ii) the Business Day following the last day of the immediately
preceding Interest Period in the case of a rollover to a successive Interest
Period, and ending one (1) month, two (2) months, or three (3) months thereafter
as Borrower shall elect in accordance with the provisions hereof, provided that
(A) any Interest Period which would otherwise end on a day which is not a London
Business Day shall be extended to the next succeeding London Business Day and
(B) any Interest Period which would otherwise end after the Maturity Date shall
end on the Maturity Date.

     "LIBOR Balance" shall mean any principal balance of this Note which,
      -------------
pursuant to an Interest Notice, bears interest at a rate based upon the Adjusted
LIBOR Rate for the Interest Period specified in such Interest Notice.

     "LIBOR Rate" shall mean, with respect to each Interest Period, the offered
      ----------
rate for U.S. Dollar deposits of not less than $1,000,000.00 for a period of
time equal to the Interest Period as of 11:00 a.m. City of London, England time
two (2) London Business Days prior to the first date of each Interest Period as
shown on the display designated as "British Bankers Association Interest
Settlement Rates" on the Telerate System ("Telerate"), Page 3750 or Page 3740,
or such other page or pages as may replace such pages on Telerate for the
purpose of displaying such rate; provided, however, that if such rate is not
available on the Telerate then such offered rate shall be otherwise
independently determined by Bank from an alternate, substantially similar
independent source available to Lender or shall be calculated by Bank by a
substantially similar methodology as that theretofore used to determine such
offered rate in Telerate.  The LIBOR Rate for the Interest Period to which it
relates shall be rounded upward, if necessary, to the nearest one-one hundredth
of one percent.

PROMISSORY NOTE - Page 2
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     "Loan Agreement" shall mean that certain Letter Loan Agreement dated March
      --------------
8, 1996  by and between Bank and Borrower as amended by that certain First
Amendment to Loan Agreement dated as of December 31, 1997 by and between
Borrower and Bank, by that certain Second Amendment to Loan Agreement dated as
of July 15, 1999 by and between Borrower and Bank, and as such agreement may be
further amended, restated, or otherwise modified from time to time.

     "Loan Documents" shall mean this Note, the Loan Agreement, and all other
      --------------
documents evidencing, securing, governing, guaranteeing, and/or pertaining to
this Note.

     "London Business Day" shall mean any day other than a Saturday, Sunday, or
      -------------------
a day on which banking institutions are generally authorized or obligated by law
or executive order to close in the City of London, England.

     "Maximum Rate" shall mean, with respect to the holder hereof, the maximum
      ------------
nonusurious interest rate, if any, that at any time, or from time to time, may
be contracted for, taken, reserved, charged, or received on the indebtedness
evidenced by this Note under the laws which are presently in effect in the
United States and the State of Texas applicable to such holder and such
indebtedness or, to the extent permitted by law, under such applicable laws of
the United States and the State of Texas which may hereafter be in effect and
which allow a higher maximum nonusurious interest rate than applicable laws now
allow.  To the extent that Chapter 303 of the Texas Credit Code, as supplemented
by the Texas Credit Title, is relevant to any holder of this Note for the
purposes of determining the Maximum Rate, each such holder elects to determine
such applicable legal rate under the Act pursuant to the "weekly rate ceiling,"
from time to time in effect, as referred to in said Chapter 303; subject,
however, to the limitations on such applicable ceiling referred to and defined
in said Chapter 303, and further subject to any right such holder may have
subsequently, under applicable law, to change the method of determining the
Maximum Rate.  If no Maximum Rate is established by applicable law, then the
Maximum Rate shall be equal to eighteen percent (18.0%).

     "Prime Rate" shall mean the rate established from time to time by Bank as
      ----------
its Prime Rate of interest (which may not be the lowest, best or most favorable
rate of interest which Bank may charge on loans to its customers).

     "Prime Rate Balance" shall mean that portion of the principal balance of
      ------------------
this Note bearing interest at a rate based upon the Prime Rate.

     "Regulation D" shall mean Regulation D of the Board of Governors of the
      ------------
Federal Reserve System from time to time in effect and shall include any
successor or other regulation relating to reserve requirements applicable to
member banks of the Federal Reserve System.

     "Reserve Requirement" shall, on any day, mean that percentage (expressed as
      -------------------
a decimal fraction) which is in effect on such day, as provided by the Board of
Governors of the Federal Reserve System (or any successor governmental body) for
determining the reserve requirements (including, without limitation, basic,
supplemental, marginal, and emergency reserves) under Regulation D with respect
to "Eurocurrency liabilities" as currently defined in Regulation D, or under any
similar or successor regulation.  For purposes of this definition, any LIBOR
Balances

PROMISSORY NOTE - Page 3
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hereunder shall be deemed "Eurocurrency liabilities" under Regulation D
without benefit of or credit for prorations, exemptions, or offsets under
Regulation D.  Bank's determination of the Reserve Requirement shall be
conclusive.

     2.   Payments of Interest and Principal.  Interest on the unpaid principal
          ----------------------------------
balance of this Note shall be due and payable on each Interest Payment Date as
it accrues and the entire unpaid principal balance of this Note, and all accrued
but unpaid interest thereon, shall be due and payable on the Maturity Date.

     3.   Rates of Interest.  The unpaid principal of the Prime Rate Balance
          -----------------
shall bear interest at a rate per annum which shall from day to day be equal to
the lesser of (i) the Prime Rate in effect from day to day, plus one percent
                                                            ----
(1.0%), or (ii) the Maximum Rate.  The unpaid principal of each LIBOR Balance
shall bear interest at a rate per annum which shall from day to day be equal to
the lesser of (i) the Adjusted LIBOR Rate for the Interest Period in effect with
respect to such LIBOR Balance, or (ii) the Maximum Rate.  Each change in the
interest rate applicable to a Prime Rate Balance shall become effective without
prior notice to Borrower automatically as of the opening of business on the date
of such change in the Prime Rate.  Interest on this Note shall be calculated on
the basis of the actual days elapsed in a year consisting of 360 days.

     4.   Interest Recapture. On each Interest Payment Date or any other date on
          ------------------
which interest payments are required hereunder, if Bank does not receive
interest on this Note computed at the Contract Rate because such Contract Rate
exceeds or has exceeded the Maximum Rate, then Borrower shall, upon the written
demand of Bank, pay to Bank in addition to the interest otherwise required to be
paid hereunder, on each Interest Payment Date thereafter, the Excess Interest
Amount (calculated as of such later Interest Payment Date); provided that in no
event shall Borrower be required to pay interest at a rate exceeding the Maximum
Rate.

     5.   Interest on Past Due Amounts.  To the extent any interest is not paid
          ----------------------------
on or before the fifth day after it becomes due and payable, Bank may, at its
option, add such accrued but unpaid interest to the principal of this Note.
Notwithstanding anything herein to the contrary, upon an Event of Default or at
maturity, whether by acceleration or otherwise, all principal of this Note
shall, at the option of Bank, bear interest at the Maximum Rate until paid.

     6.   Interest Option. Subject to the provisions hereof, Borrower shall have
          ---------------
the option (an "Interest Option") of having designated portions of the unpaid
                ---------------
principal balance of this Note bear interest at a rate based upon the Adjusted
LIBOR Rate or Prime Rate as provided in paragraph 3 hereof; provided, however,
                                        -----------
that the selection of the Adjusted LIBOR Rate for a particular Interest Period
shall not be for less than $1,000,000.00 of unpaid principal or $250,000
increments above such minimum amount.  The Interest Option shall be exercised in
the manner provided below:

          (i)   At Time of Borrowing. Contemporaneously with each request for an
                --------------------
     advance by Borrower under paragraph 9 herein, Borrower shall give Bank an
                               -----------
     Interest Notice indicating the initial Interest Option selected with
     respect to the principal balance of such advance.

PROMISSORY NOTE - Page 4
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          (ii)  At Expiration of Interest Periods.  At least two (2) Business
                ---------------------------------
     Days prior to the termination of any Interest Period, Borrower shall give
     Bank an Interest Notice indicating the Interest Option to be applicable to
     the corresponding LIBOR Balance upon the expiration of such Interest
     Period.  If the required Interest Notice shall not have been timely
     received by Bank prior to the expiration of the then-relevant Interest
     Period, Borrower shall be deemed to have selected a rate based upon the
     Prime Rate to be applicable to such LIBOR Balance upon the expiration of
     such Interest Period and to have given Bank notice of such selection.

          (iii)  Conversion From Prime Rate.  During any period in which any
                 --------------------------
     portion of the principal hereof bears interest at a rate based upon the
     Prime Rate, Borrower shall have the right, on any Business Day (the
     "Conversion Date"), to convert all or a portion of such principal amount
     ----------------
     from the Prime Rate Balance to a LIBOR Balance by giving Bank an Interest
     Notice of such selection at least two (2) Business Days prior to such
     Conversion Date.

An Interest Notice may be written or oral and Bank is hereby authorized and
directed to honor all telephonic Interest Notices hereunder.  Borrower agrees to
indemnify and hold Bank harmless from any loss or liability incurred by Bank in
connection with honoring any telephonic or other oral Interest Notices.  All
written Interest Notices are effective only upon receipt by Bank.  Each Interest
Notice shall be irrevocable and binding upon Borrower.

     7.   Special Provisions For LIBOR Pricing.
          ------------------------------------

          a.  Inadequacy of LIBOR Loan Pricing.  If Bank determines that, by
              --------------------------------
reason of circumstances affecting the interbank eurodollar market generally,
deposits in Dollars (in the applicable amounts) are not being offered to United
States financial institutions in the interbank eurodollar market for such
Interest Period, or that the rate at which such Dollar deposits are being
offered will not adequately and fairly reflect the cost to Bank of making or
maintaining a LIBOR Balance for the applicable Interest Period, Bank shall
forthwith give notice thereof to Borrower, whereupon until Bank notifies
Borrower that the circumstances giving rise to such suspension no longer exist,
(i) the right of Borrower to select an Interest Option based upon the LIBOR Rate
shall be suspended, and (ii) Borrower shall be deemed to have converted each
LIBOR Balance to the Prime Rate Balance in accordance with the provisions hereof
on the last day of the then-current Interest Period applicable to such LIBOR
Balance.

          b.  Illegality.  If the adoption of any applicable law, rule, or
              ----------
regulation, or any change therein, or any change in the interpretation or
administration thereof by any governmental authority, central bank, or
comparable agency charged with the interpretation or administration thereof, or
compliance by Bank with any request or directive (whether or not having the
force of law) of any such authority, central bank, or comparable agency shall
make it unlawful or impossible for Bank to make or maintain a LIBOR Balance,
Bank shall so notify Borrower.  Upon receipt of such notice, Borrower shall be
deemed to have converted any LIBOR Balance to the Prime Rate Balance, on either
(i) the last day of the then-current Interest Period applicable to such LIBOR
Balance if Bank may lawfully continue to maintain and fund such LIBOR Balance to
such day, or (ii) immediately, if Bank may not lawfully continue to maintain
such LIBOR Balance to such day.

PROMISSORY NOTE - Page 5
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     8.   Extension, Place and Application of Payments. Should the principal of,
          --------------------------------------------
or any interest on, this Note become due and payable on any day other than a
Business Day, the maturity thereof shall be extended to the next succeeding
Business Day, and interest shall be payable with respect to such extension. All
payments of principal of, and interest on, this Note shall be made in lawful
money of the United States of America in immediately available funds. Payments
made to Bank by Borrower hereunder shall be applied first to accrued but unpaid
interest and then to outstanding principal.

     9.   Advances.  Subject to the terms of this Note and the Loan Agreement,
          --------
Borrower may request advances (each an "Advance") hereunder and make payments
                                        -------
from time to time during the term of this Note, provided that it is understood
and agreed that the aggregate principal amount outstanding from time to time
hereunder shall not exceed the sum of the Total Principal Amount.  The unpaid
balance of this Note shall increase and decrease with each new Advance or
payment hereunder as the case may be.  This Note shall not be deemed terminated
or canceled prior to the Maturity Date, although the entire principal balance
hereof may from time to time be paid in full.  Subject to the provisions of this
Note and the Loan Agreement, Borrower may borrow, repay, and reborrow hereunder
from the date hereof until the Maturity Date.  Each Advance hereunder shall be
in an amount not less than $10,000.00 or an integral multiple thereof.  If any
Advance request is received by Bank on or prior to 12:00 p.m. (Dallas, Texas
time) on funds designated to accrue interest at the Prime Rate, Bank shall make
available at Bank's office in Dallas, Texas not later than 2:00 p.m. (Dallas,
Texas time) on the day of such Advance request (or the date specified in such
request), the amount of such request in immediately available funds.  If any
Advance request is received by Bank after 12:00 p.m. (Dallas, Texas time) on
funds designated to accrue interest at the Prime Rate, Bank shall make available
at Bank's office in Dallas, Texas not later than 2:00 p.m. (Dallas, Texas time)
on the Business Day after the day of such request (or a later date if specified
in such request), the amount of such request in immediately available funds.
Each request for an Advance on funds designated to accrue interest at the
Adjusted LIBOR Rate must be received by Bank not less than three (3) Business
Days prior to the date upon which the Advance requested is desired by Borrower.
Each request for an Advance hereunder must be accompanied by an Interest Notice
for the funds to be advanced thereunder; provided, however, if an Interest
Notice does not accompany an Advance request, Borrower shall be deemed to have
designated the Prime Rate.  Each request for an Advance by Borrower hereunder
shall be irrevocable and binding on Borrower.  An Advance request may be written
or oral and Bank is authorized and directed to honor all telephonic requests for
Advances from any person authorized to request Advances hereunder.

     Borrower agrees to indemnify and hold Bank harmless from any loss or
liability incurred by Bank in connection with honoring any such telephonic or
other oral requests for Advances.

     All written Advance requests are effective only upon receipt by Bank.

     10.  Loan Agreement.  This Note is subject to the terms and provisions of
          --------------
the Loan Agreement, which is incorporated herein by reference for all purposes.
The holder of this Note is entitled to the benefits provided in the Loan
Agreement.

     11.  Prepayments; Consequential Loss.  Any prepayment made hereunder shall
          -------------------------------
be made together with all interest accrued but unpaid on this Note through the
date of such prepayment.

PROMISSORY NOTE - Page 6
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Contemporaneously with each prepayment of principal, Borrower shall give Bank
written or oral notice indicating whether such prepayment is to be applied to
the Prime Rate Balance or a particular LIBOR Balance. If such notice is not
timely received by Bank, Borrower shall be deemed to have selected to prepay the
Prime Rate Balance and, if any sums remain after satisfying all of the Prime
Rate Balance, the remaining sums shall be applied to any LIBOR Balance(s) as
Bank determines in its sole discretion. Borrower agrees to indemnify and hold
Bank harmless from any loss or liability incurred by Bank in connection with
honoring telephonic or other oral notices indicating how a prepayment is to be
applied. If Borrower makes any payment of principal with respect to any LIBOR
Balance on any day prior to the last day of the Interest Period applicable to
such LIBOR Balance, Borrower shall reimburse Bank on demand the Consequential
Loss incurred by Bank as a result of the timing of such payment. A certificate
of Bank setting forth the basis for the determination of a Consequential Loss
shall be delivered to Borrower and shall, in the absence of manifest error, be
conclusive and binding as to such determination and amount.

     12.  Additional Costs.  Borrower agrees to pay to Bank all Additional Costs
          ----------------
within ten (10) days of receipt by Borrower from Bank of a statement setting
forth the amount or amounts due and the basis for the determination from time to
time of such amount or amounts, which statement shall be conclusive and binding
upon Borrower absent manifest error.  Failure on the part of Bank to demand
compensation for any Additional Costs in any Interest Period shall not
constitute a waiver of Bank's right to demand compensation for any Additional
Costs incurred during any such Interest Period or in any other subsequent or
prior Interest Period.  The term "Additional Costs" shall mean such additional
                                  ----------------
amount or amounts as Bank shall reasonably determine will compensate Bank for
actual costs incurred by Bank in maintaining LIBOR Rates on the LIBOR Balances
or any portion thereof as a result of any change, after the date of this Note,
in applicable law, rule or regulation or in the interpretation or administration
thereof by, or the compliance by Bank with any request or directive from, any
domestic or foreign governmental authority charged with the interpretation or
administration thereof (whether or not having the force of law) or by any
domestic or foreign court changing the basis of taxation of payments to Bank of
the LIBOR Balances or interest on the LIBOR Balances or any portion thereof at
an Adjusted LIBOR Rate or any other fees or amounts payable under this Note or
the Loan Agreement (other than taxes imposed on all or any portion of the
overall net income of Bank by the State of Texas or the Federal government), or
imposing, modifying or applying any reserve, special deposit or similar
requirement against assets of, deposits with or for the account of, credit
extended by, or any other acquisition of funds for loans by Bank, or imposing on
Bank, as the case may be, or on the London interbank market any other condition
affecting this Note, the Loan Agreement or the LIBOR Balances so as to increase
the cost of Bank making or maintaining Adjustable LIBOR Rates with respect to
the LIBOR Balances or any portion thereof or to reduce the amount of any sum
received or receivable by Bank under this Note or the Loan Agreement (whether of
principal, interest or otherwise), by an amount deemed by Bank in good faith to
be material, but without duplication for any Reserve Requirement.

     13.  Notices.  Except as otherwise specified herein, all notices and
          -------
requests required or permitted hereunder shall be given in accordance with
paragraph 16 of the Loan Agreement.
------------

     14.  Legal Fees.  If this Note is placed in the hands of any attorney for
          ----------
collection, or if it is collected through any legal proceeding at law or in
equity or in bankruptcy, receivership, or other

PROMISSORY NOTE - Page 7
<PAGE>

court proceedings, Borrower agrees to pay all costs of collection including, but
not limited to, court costs and reasonable attorneys' fees.

     15.  Waivers.  Borrower and each surety, endorser, guarantor, and any other
          -------
party ever liable for payment of any sums of money payable on this Note, jointly
and severally waive presentment and demand for payment, protest, notice of
protest, intention to accelerate, acceleration and non-payment, or other notice
of default, and agree that their liability under this Note shall not be affected
by any renewal or extension in the time of payment hereof, or in any
indulgences, or by any release or change in any security for the payment of this
Note, and hereby consent to any and all renewals, extensions, indulgences,
releases, or changes, regardless of the number of such renewals, extensions,
indulgences, releases, or changes; provided, however, this Note may not be
amended or modified except by a written instrument signed by the Borrower and
the holder hereof.  No waiver by Bank of any of its rights or remedies hereunder
or under any other document evidencing or securing this Note or otherwise shall
be considered a waiver of any other subsequent right or remedy of Bank; no delay
or omission in the exercise or enforcement by Bank of any rights or remedies
shall ever be construed as a waiver of any right or remedy of Bank; and no
exercise or enforcement of any such rights or remedies shall ever be held to
exhaust any right or remedy of Bank.

     16.  Remedies.  Upon the occurrence of any Event of Default, the holder
          --------
hereof may, at its option, (i) declare the entire unpaid balance of principal
and accrued but unpaid interest on this Note to be immediately due and payable,
(ii) refuse to advance any additional amounts under this Note, (iii) foreclose
all liens securing payment hereof, (iv) pursue any and all other rights,
remedies, and recourses available to the holder hereof, including but not
limited to, any such rights, remedies, or recourses under the Loan Documents, at
law or in equity, or (v) pursue any combination of the foregoing.

     17.  Spreading.  Any provision herein, or in any document securing this
          ---------
Note, or any other document executed or delivered in connection herewith, or in
any other agreement or commitment, whether written or oral, expressed or
implied, to the contrary notwithstanding, neither Bank nor any holder hereof
shall in any event be entitled to receive or collect, nor shall or may amounts
received hereunder be credited, so that Bank or any holder hereof shall be paid,
as interest, a sum greater than the maximum amount permitted by applicable law
to be charged to the person, partnership, firm or corporation primarily
obligated to pay this Note at the time in question.  If any construction of this
Note or any document securing this Note, or any and all other papers, agreements
or commitments, indicate a different right given to Bank or any holder hereof to
ask for, demand or receive any larger sum as interest, such is a mistake in
calculation or wording which this clause shall override and control, it being
the intention of the parties that this Note, and all other instruments securing
the payment of this Note or executed or delivered in connection herewith shall
in all things comply with the applicable law and proper adjustments shall
automatically be made accordingly.  In the event that Bank or any holder hereof
ever receives, collects or applies as interest any sum in excess of the Maximum
Rate, if any, such excess amount shall be applied to the reduction of the unpaid
principal balance of this Note, and if this Note is paid in full, any remaining
excess shall be paid to Borrower.  In determining whether or not the interest
paid or payable, under any specific contingency, exceeds the Maximum Rate, if
any, Borrower and Bank or any holder hereof shall, to the maximum extent
permitted under applicable law: (a) characterize any nonprincipal payment as an
expense or fee

PROMISSORY NOTE - Page 8
<PAGE>

rather than as interest, (b) exclude voluntary prepayments and the effects
thereof, (c) "spread" the total amount of interest throughout the entire term of
this Note; provided that if this Note is paid and performed in full prior to the
end of the full contemplated term hereof, and if the interest received for the
actual period of existence thereof exceeds the Maximum Rate, if any, Bank or any
holder hereof shall refund to Borrower the amount of such excess, or credit the
amount of such excess against the aggregate unpaid principal balance of all
advances made by the Bank or any holder hereof under this Note at the time in
question.

     18.  Choice of Law.  This Note is being executed and delivered, and is
          -------------
intended to be performed in the State of Texas.  Except to the extent that the
laws of the United States may apply to the terms hereof, the substantive laws of
the State of Texas shall govern the validity, construction, enforcement and
interpretation of this Note.  In the event of a dispute involving this Note or
any other instruments executed in connection herewith, the undersigned
irrevocably agrees that venue for such dispute shall lie in any court of
competent jurisdiction in Dallas County, Texas.

     19.  Renewal.  This Note renews and extends amounts unpaid this date under
          -------
that certain promissory note dated July 15, 1999 in the stated principal amount
of $7,500,000.00 executed by Borrower and payable to the order of Bank.

     20.  Entire Agreement.  THIS NOTE (TOGETHER WITH THE OTHER LOAN DOCUMENTS)
          ----------------
CONTAINS THE ENTIRE AGREEMENT BETWEEN THE PARTIES AND MAY NOT BE CONTRADICTED BY
EVIDENCE OF PRIOR, CONTEMPORANEOUS, OR SUBSEQUENT ORAL AGREEMENTS OF THE
PARTIES.  THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

                              RF MONOLITHICS, INC.

                              By:       /s/ David Kirk
                                 ---------------------------
                              Name:     David Kirk
                                   -------------------------
                              Title:    President & CEO
                                    ------------------------

PROMISSORY NOTE - Page 9<PAGE>

                                                                   EXHIBIT 10.33

                WAIVER AND AMENDMENT TO MASTER LEASE AGREEMENT
                ----------------------------------------------

     This WAIVER AND AMENDMENT TO MASTER LEASE AGREEMENT ("Amendment") is
                                                           ---------
entered into as of February 29, 2000 (the "Amendment Date"), by and between RF
                                           --------------
MONOLITHICS, INC., a Delaware corporation ("Lessee") and BANC ONE LEASING
                                            ------
CORPORATION ("Lessor").
              ------

                                 RECITALS:

     A.  Lessor and Lessee are party to that certain Master Lease Agreement
dated as of November 3, 1995 (including the addendum and schedules thereto and
all other amendments, supplements, or modifications thereof, the "Master Lease")
                                                                  ------------
pursuant to which Lessor has leased to Lessee certain equipment on the terms set
forth in the Master Lease.

     B.  Lessee has requested that Lessor amend certain provisions of the Master
Lease.

     C.  Subject to satisfaction of the conditions set forth herein, Lessor is
willing to amend the Master Lease.

     NOW, THEREFORE, in consideration of the mutual covenants and agreements
contained herein and for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto hereby agree as
follows:

                                  ARTICLE 1.

                                 Definitions
                                 -----------

     Section 1.1.  Definitions.  Unless otherwise defined in this Amendment,
                   -----------
each capitalized term used in this Amendment has the meaning given to such term
in the Master Lease.

                                  ARTICLE 2.

                          Waiver of Events of Default
                          ---------------------------

     Section 2.1.  Waiver of Events of Default.  Certain events of default have
                   ---------------------------
occurred under the Master Lease as follows: (a) default under clause (b) of the
                                                              ----------
first sentence of Section 14 of the Master Lease for failure to maintain the
                  ----------
required financial covenants set forth in Section 18 (including as set forth in
                                          ----------
the Covenant Addendum to Master Lease) and (b) default under clause (d) of the
                                                             ----------
first sentence of Section 14 resulting from the occurrence of certain events of
                  ----------
default under that certain Letter Loan Agreement dated March 8, 1996 by and
between Lessee and Bank One, Texas, National Association.  Effective as of the
Amendment Date, and subject to the conditions precedent contained herein, Lessor
hereby waives the events of default existing on the Amendment Date described in
the preceding sentence.

WAIVER AND AMENDMENT TO MASTER LEASE AGREEMENT - Page 1
<PAGE>

                                  ARTICLE 3.

                          Amendments to Master Lease
                          --------------------------

     Section 3.1.  Amendment to Section 18 of the Master Lease.  Effective as of
                   -------------------------------------------
the Amendment Date, the last sentence of Section 18 of the Master Lease is
                                         ----------
hereby deleted.

     Section 3.2.  Amendment to Covenant Addendum to Master Lease Agreement.
                   --------------------------------------------------------
Effective as of the Amendment Date, paragraph 2 of the Covenant Addendum to
                                    -----------
Master Lease Agreement (such addendum being attached to the Master Lease and
incorporated therein) is hereby amended and restated in its entirety as follows:

          2.  The following is added to Section 18 of the Master Lease:

     During the term of this Lease, Lessee agrees and covenants that it will at
     all times maintain the following financial covenants:

              (a) Quick Ratio.  Lessee will, beginning as of November 30, 2000
                  -----------
          and at all times thereafter, maintain a ratio of (1) current assets
          minus inventory, to (2) current liabilities plus the unpaid principal
          -----                                       ----
          balance of the Revolving Line of Credit of not less than 1.25 to 1.00.

              (b) Tangible Net Worth.  Lessee will, at all times, maintain its
                  ------------------
          Tangible Net Worth at not less than $29,500,000.

              (c) Liabilities/Tangible Net Worth.  Lessee will at all times
                  ------------------------------
          maintain a ratio of (1) total liabilities, to (2) Tangible Net Worth,
          of not greater than 0.50 to 1.00.

               (d) Fixed Charge Ratio.  Lessee will, beginning as of November
                   ------------------
          30, 2000 and at all times thereafter, maintain a ratio of (1) net
          income after taxes, plus depreciation, amortization, interest expense,
                              ----
          and long-term lease and rent expense, for the twelve (12) months
          ending as of any date of determination, to (2) without duplication (A)
          current maturities of long-term debt as of the date of determination,

          plus (B) current maturities of capitalized leases as of the date of
          ----
          determination, plus (C) interest expense for the preceding twelve (12)
                         ----
          months, plus (D) lease and rent expense for the preceding twelve (12)
                  ----
          months, of not less than 2.00 to 1.00.

               (e) Minimum EBITDA.  Lessee will not, as of the end of each of
                   --------------
          the fiscal quarters of Lessee set forth below, permit the sum of its
          net income, plus depreciation, amortization, interest expense, and
                      ----
          income taxes for the three (3) month period ending with such fiscal
          quarter to be less than the amount set forth opposite the applicable
          period in the table below:

WAIVER AND AMENDMENT TO MASTER LEASE AGREEMENT - Page 2
<PAGE>

<TABLE>
<CAPTION>

        Period                                         Minimum EBITDA
        --------------------------------------------------------------------
<S>                                                    <C>
        Three months ending February 29, 2000                      -$666,000
        --------------------------------------------------------------------

        Three months ending May 31, 2000                          $1,007,000
        --------------------------------------------------------------------

        Three months ending August 31, 2000                       $2,069,000
        --------------------------------------------------------------------
</TABLE>

     Unless otherwise specified, all accounting and financial terms and
     covenants set forth above are to be determined according to generally
     accepted accounting principles, consistently applied.  As used herein, the
     following terms shall mean as follows:

          "Tangible Net Worth" means, as of any date, Lessee's total assets
           ------------------
     excluding all intangible assets, less total liabilities excluding any
                                      ----
     indebtedness owing by Lessee which has been subordinated by written
     agreement to all indebtedness now or hereafter owing by Lessee to the Bank.

          "Revolving Line of Credit" shall have the meaning specified in the
           ------------------------
     Loan Agreement.

                                  ARTICLE 4.

                                  Conditions
                                  ----------

     Section 4.1.  Items to be Delivered By Lessee.  The effectiveness of this
                   -------------------------------
Amendment is subject to Lessee's delivery to Lessor of each other agreement,
certificate, document, or instrument required by Lessor to be executed or
delivered by Lessee or any other party in connection with this Amendment or the
transactions contemplated in connection herewith (including, without limitation,
an amendment to the certain Letter Loan Agreement, dated as of March 8, 1996,
between Lessee and Bank One, Texas, National Association; this Amendment and all
such other agreements, certificates, documents, and instruments are referred to
collectively herein as the "Amendment Documents"), duly executed or delivered by
                            -------------------
the parties thereto.

     Section 4.2.  Other Conditions.  This Amendment shall become effective upon
                   ----------------
the following conditions precedent being performed to Lessor's satisfaction.
Lessee's failure to comply with the following conditions shall be an event of
default under the Master Lease:

          (a) Continued Effect of Representations and Warranties.  All
              --------------------------------------------------
     representations and warranties contained in the Master Lease (as amended
     hereby) shall be true, correct, and complete in all material respects (as
     determined by Lessor in its sole discretion) except as disclosed otherwise
     to Lessor in writing and as acceptable to Lessor or representations
     specifically relating to a prior date or no longer relevant due to the
     occurrence of an event or circumstances specifically permitted hereunder or
     by the Master Lease;

WAIVER AND AMENDMENT TO MASTER LEASE AGREEMENT - Page 3
<PAGE>

          (b) Absence of Default.  No event of default shall have occurred and
              ------------------
     be continuing (after giving effect to this Amendment);

          (c) Corporate Proceedings.  All corporate proceedings taken in
              ---------------------
     connection with the transactions contemplated by this Amendment and all
     other agreements, documents, and instruments executed and/or delivered
     pursuant hereto, and all legal matters incident thereto, shall be
     satisfactory to Lessor and its legal counsel;

          (d) Fees and Expenses.  Payment or reimbursement to Lessor for all
              -----------------
     expenses, costs, and fees incurred by, or due to, Lessor in connection with
     negotiating and documenting this Amendment and the other Amendment
     Documents to the extent invoiced or otherwise billed by Lessor to Lessee;

          (e) Additional Information.  Lessee shall have received such
              ----------------------
     additional agreements, certificates, documents, instruments, and
     information as Lessee or its legal counsel may request to effect the
     transactions contemplated hereby.

     Section 4.3  Other Agreements.  In addition to the conditions set forth in
                  ----------------
Section 4.1 and Section 4.2 of this Amendment, Lessee agrees as follows:
-----------     -----------

          (a) On or before March 31, 2000, at Lessee's cost not in excess of
     $12,500, Lessee will provide Lessor with an appraisal of all equipment and
     other property covered by the Master Lease, such appraisal to be in form
     acceptable to Lessor and performed by an appraiser acceptable to Lessor.

          (b) On or before March 31, 2000, the existing balance of Lessee's
     lease line of credit (currently $313,341.97) together with all accrued and
     unpaid interest and other charges (if any) outstanding with Lessor will be
     repaid in full, such repayment being accomplished by (A) Lessee selling the
     equipment described on Exhibit B hereto (the "New Equipment") to Lessor and
                            ---------              -------------
     executing a Schedule (as defined in the Master Lease) or an amendment to an
     existing Schedule between Lessee and Lessor whereby the New Equipment, with
     a total cost to Lessor of $290,500, is leased to Lessee upon terms
     acceptable to Lessor and (B) making payment of all remaining principal,
     interest, and other charges in immediately available funds on the date of
     executing such Schedule or amendment.

Lessee agrees that failure to comply with the terms of this Section 4.3 shall
                                                            -----------
constitute an event of default under the Master Lease.

                                  ARTICLE 5.

                        Representations and Warranties
                        ------------------------------

     Section 5.1.  Representations and Warranties.  Lessee hereby represents and
                   ------------------------------
warrants to Lessor that, as of the date of and after giving effect to this
Amendment:

WAIVER AND AMENDMENT TO MASTER LEASE AGREEMENT - Page 4
<PAGE>

          (a) the execution, delivery, and performance of this Amendment and any
     and all other Amendment Documents executed and/or delivered in connection
     herewith have been authorized by all requisite action on the part of Lessee
     and will not violate Lessee's certificate of incorporation, bylaws, or
     other similar constituent documents;

          (b) except as set forth in Exhibit A hereto, all representations and
                                     ---------
     warranties set forth in the Master Lease and the Schedules thereto are true
     and correct in all material respects as if made again on and as of such
     date (except as disclosed otherwise to Lessor in writing and as acceptable
     to Lessor or representations specifically relating to a prior date or no
     longer relevant due to the occurrence of an event or circumstances
     specifically permitted hereunder or under the Master Lease);

          (c) no event of default has occurred and is continuing under the
     Master Lease; and

          (d) the Master Lease (as amended by this Amendment) is and remains
     legal, valid, binding, and enforceable obligations of Lessee.

                                  ARTICLE 6.

                                 Miscellaneous
                                 -------------

     Section 6.1.  The waiver described in Section 2.1 of this Amendment shall
                                           -----------
not constitute and shall not be deemed a waiver of any other event of default
under the Master Lease, whether arising as a result of the further violation of
the provisions of the Master Lease or otherwise, or a waiver of any rights or
remedies arising as a result of such other events of default.

     Section 6.2.  Governing Law.  THIS AMENDMENT, AND ALL DOCUMENTS AND
                   -------------
INSTRUMENTS EXECUTED IN CONNECTION HEREWITH, SHALL BE GOVERNED BY AND CONSTRUED
ACCORDING TO THE LAWS OF THE STATE OF OHIO.

     Section 6.3.  Agreement Remains in Effect; No Waiver.  Except as expressly
                   --------------------------------------
provided herein, all terms and provisions of the Master Lease shall remain
unchanged and in full force and effect and are hereby ratified and confirmed.
No delay or omission by Lessor in exercising any power, right, or remedy shall
impair such power, right, or remedy or be construed as a waiver thereof or an
acquiescence therein, and no single or partial exercise of any such power,
right, or remedy shall preclude other or further exercise thereof or the
exercise of any other power, right, or remedy under the Master Lease or
otherwise.

     Section 6.4.  Survival of Representations and Warranties.  All
                   ------------------------------------------
representations and warranties made in this Amendment or the Master Lease shall
survive the execution and delivery of this Amendment, and no investigation by
Lessor or any closing shall affect the representations and warranties or the
right of Lessor to rely upon them.

WAIVER AND AMENDMENT TO MASTER LEASE AGREEMENT - Page 5
<PAGE>

     Section 6.5.  Reference to Master Lease.  Each of the Schedules to the
                   -------------------------
Master Lease, and any and all other agreements, documents, or instruments now or
hereafter executed and/or delivered pursuant to the terms of the Master Lease,
are hereby amended so that any reference in such agreements, documents, or
instruments to the Master Lease shall mean a reference to the Master Lease as
amended hereby.

     Section 6.6.  Severability.  Any provision of this Amendment held by a
                   ------------
court of competent jurisdiction to be invalid or unenforceable shall not impair
or invalidate the remainder of this Amendment and the effect thereof shall be
confined to the provision so held to be invalid or unenforceable.

     Section 6.7.  Successors and Assigns.  This Amendment is binding upon and
                   ----------------------
shall inure to the benefit of Lessor and Lessee and their respective successors
in interest and assigns.  Lessee may not assign any right, power, duty, or
obligation hereunder without the prior written consent of Lessor.

     Section 6.8.  Headings.  The headings, captions, and arrangements used in
                   --------
this Amendment are for convenience only and shall not affect the interpretation
of this Amendment.

     Section 6.9.  Expenses of Lessor.  Lessee agrees to pay on demand all,
                   ------------------
third party out-of-pocket costs and expenses incurred by Lessor in connection
with the preparation, negotiation, and execution of this Amendment or any other
agreement, document, or instrument executed pursuant hereto (including, without
limitation, fees and costs of Lessor's legal counsel and fees and costs
associated with appraisals of the equipment as referenced in Section 4.3 of this
                                                             -----------
Amendment) and all costs and expenses incurred by Lessor in connection with the
enforcement or preservation of any rights under the Master Lease, as amended
hereby, including, without limitation, the costs and fees of Lessor's legal
counsel.

     Section 6.10. Counterparts.  This Amendment may be executed simultaneously
                   ------------
in one or more multiple originals and on telecopy counterparts, each of which
shall be deemed an original, but all of which together shall constitute one and
the same agreement.

     Section 6.11. Waiver of Claims and Defenses.  To induce Lessor to enter
                   -----------------------------
into this Amendment, Lessee represents and warrants that as of the Amendment
Date there are no claims or offsets against or defenses or counterclaims to
Lessee's obligations under the Master Lease, and Lessee waives any and all such
claims, offsets, defenses, or counterclaims whether known or unknown, arising
prior to the Amendment Date.  Additionally, Lessee hereby releases Lessor and
each of its respective legal representatives, successors, affiliates, parent,
subsidiaries, predecessors, assigns, shareholders, partners, trustees,
beneficiaries, administrators, heirs, former and current officers, directors,
agents, attorneys, and employees, and its respective successors, assigns, heirs,
executors, and administrators from any and all claims, actions, suits, causes of
action, accounts, judgments, agreements, promises, executions, debts, damages,
demands, rights, obligations, liabilities, and controversies now in existence
concerning or in connection with the Master Lease or this Amendment
(collectively, the "Claims") of every nature and description, in law or in
                    ------
equity,

WAIVER AND AMENDMENT TO MASTER LEASE AGREEMENT - Page 6
<PAGE>

whether known or unknown, foreseen or unforseen, and regardless of whether
Lessee hereafter discovers any facts which may give rise to any Claim.

     Section 6.12.  Lease Characterization.  Nothing contained in any Amendment
                    ----------------------
Document shall constitute a change of character of the Master Lease into any
other type of transaction.  Lessee hereby waives any right to assert in any
proceeding or litigation that any lease described in the Master Lease is a
conditional or disguised sale, a secured transaction covered under Article or
Section 9 of the Uniform Commercial Code, or any form of transaction other than
a true lease.

     Section 6.13.  Entire Agreement.  This Amendment, together with the Master
                    ----------------
Lease, as written, represents the final agreement between Lessor and Lessee and
may not be contradicted by evidence of prior, contemporaneous, or subsequent
oral agreements between Lessor and Lessee.  There are no unwritten agreements
between Lessor and Lessee.

                 [Remainder of page intentionally left blank]

WAIVER AND AMENDMENT TO MASTER LEASE AGREEMENT - Page 7
<PAGE>

     IN WITNESS WHEREOF, Lessee and Lessor have caused this Amendment to be
executed and delivered by their duly authorized officers effective as of the
date first written above.

                                    LESSEE:
                                    ------

                                    RF MONOLITHICS, INC.

                                    By:     /s/ David Kirk
                                        -------------------------------------
                                    Name:   David Kirk
                                          -----------------------------------
                                    Title:  President & CEO
                                           ----------------------------------

                                    LESSOR:
                                    ------

                                    BANC ONE LEASING CORPORATION

                                    By:      /s/ Jacqueline L. Kernodle
                                        -------------------------------------
                                    Name:    Jacqueline L. Kernodle
                                          -----------------------------------
                                    Title:   Assistant Vice President
                                           ----------------------------------

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