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                              COMERICA BANK-TEXAS
                  8911 Capital of Texas Highway, Suite 2310
                              Austin, Texas 78759

                                 June 4, 2002

Silicon Laboratories Inc.
4635 Boston Lane
Austin, Texas 78735

         RE:    Credit Agreement dated September 5, 2001 (as heretofore amended
                or modified, the "Agreement") between Silicon Laboratories Inc.
                ("Borrower") and Comerica Bank-Texas ("Bank")

Ladies and Gentlemen:

         Capitalized terms used and not otherwise defined herein have the
meanings given them in the Agreement. Borrower and Bank desire to amend the
Agreement for the purposes expressed herein.

         The first sentence of Section 5.8 of the Agreement is hereby amended
in its entirety to read as follows:

         Make Capital Expenditures or commit to make Capital Expenditures, in
         an aggregate amount that exceeds $25,000,000 in any fiscal year.

         This letter agreement shall become effective as of the date first
above written when and only when Bank shall have received, at Bank's office, a
counterpart of this agreement executed and delivered by Borrower. The
Agreement as hereby amended is hereby ratified and confirmed in all respects.
Any reference to the Agreement in any Loan Document shall be deemed to be a
reference to the Agreement, as hereby amended. The execution, delivery and
effectiveness of this letter agreement shall not, except as expressly provided
herein, operate as a waiver of any right, power or remedy of Bank under the
Agreement or any other Loan Document nor constitute a waiver of any other
provisions of the Agreement or any other Loan Document.

         This letter agreement may be separately executed by Borrower and Bank
in any number of counterparts, each of which when so executed and delivered,
shall be deemed to be an original and all of which, when so executed and
delivered, shall be deemed to be an original and all of which, taken together,
shall constitute but one and the same agreement. This agreement shall be

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governed by and construed under to laws of the State of Texas, without giving
effect to the conflict-of-laws principles thereof.

         Please indicate your agreement to the foregoing by executing where
indicated below and returning a copy to the undersigned at the address given
above.

                                       Yours truly,

                                       COMERICA BANK-TEXAS

                                       By: /s/ JULIE A. SMITH
                                          -------------------------------------
                                           Julie A. Smith
                                           Vice President

Agreed to as of the date first written above

SILICON LABORATORIES INC.

By:  /s/ NAVDEEP SOOCH
   ------------------------------
   Name: Navdeep Sooch
        -------------------------
   Title: CHAIRMAN AND CEO
         ------------------------

By:  /s/ JOHN W. MCGOVERN
   ------------------------------
   Name: John W. McGovern
        -------------------------
   Title: CHIEF FINANCIAL OFFICER
         ------------------------

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[COMERICA LOGO]     NO ORAL AGREEMENTS

--------------------------------------------------------------------------------

         This Agreement is executed on June 4th, 2002, by Silicon Laboratories
Inc. ("Borrower") and Comerica Bank - Texas, a Texas banking association
("Lender"), in connection with credit accommodations made by the Lender to the
Borrower (the "Loan").

         The parties covenant and agree as follows:

(1)      The rights and obligations of the parties shall be determined solely
         from the written "Loan Agreement" (as such term is defined in Section
         26.02(a)(2) of the Texas Business and Commerce Code) executed and
         delivered in connection with the Loan, and any oral agreements
         between or among the parties are superseded by and merged into the
         Loan Agreement.

(2)      The Loan Agreement has not been and may not be varied by any oral
         agreements or discussions that have or may occur before,
         contemporaneously with, or subsequent thereto.

(3)      THE WRITTEN LOAN AGREEMENT REPRESENTS THE FINAL 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 AMONG THE PARTIES.

         Executed and delivered as of the date first written above.

BORROWER:                                           LENDER:

SILICON LABORATORIES INC.                   COMERICA BANK - TEXAS

By:  /s/ NAVDEEP SOOCH                              By: /s/ JULIE A. SMITH
   ------------------------------                      -------------------------
Printed Name: Navdeep Sooch                         Printed Name: Julie A. Smith
Its: Chief Executive Officer                        Its: Vice President

By:  /s/ JOHN W. MCGOVERN
   ------------------------------
Printed Name: John W. McGovern
Its: Chief Financial Officer<PAGE>
                                                                    Exhibit 10.1

<TABLE>
<S>                               <C>                                <C>
Public Relations Contact:         Company Contact:                   Investor Relations Contact:
Adam Mazur                        Dennis E. Valentine                Tim Clemensen
Rubenstein Public Relations       Chief Financial Officer            Rubenstein Investor Relations
(212) 843-8073                    (760) 602-3292                     (212) 843-9337
amazur@rubensteinpr.com           www.jmar.com                       tclemensen@rubensteinir.com
</TABLE>

FOR IMMEDIATE RELEASE

                JMAR FOUNDER, JOHN S. MARTINEZ TO RETIRE AS CEO,
                            WILL CONTINUE AS DIRECTOR

     - LED DEVELOPMENT OF PIONEERING NEXT-GENERATION LITHOGRAPHY TECHNOLOGY

SAN DIEGO, CALIFORNIA (JULY 19, 2002) -- JMAR TECHNOLOGIES, INC. (NASDAQ NM:
JMAR), a leading developer and supplier of precision systems for the
microelectronics industry, announced today the retirement as CEO of John S.
Martinez, Ph.D., its principal founder. He has served as the Company's Chairman
and CEO since its formation in 1987 and will continue to serve in his current
position until August 15, 2002. The Company has retained a Silicon Valley-based
executive search firm to identify and evaluate qualified applicants not
currently affiliated with JMAR for the position of CEO. If no such applicant is
selected and available by August 16th, Joseph G. Martinez, JMAR's Senior Vice
President and General Counsel has been selected by the Directors to serve as
Interim CEO until a permanent CEO is elected. In anticipation of the succession,
JMAR has re-scheduled its annual shareholders meeting from its usual August date
to later in the year.

Commenting on his decision to retire, Dr. Martinez said, "Founding and building
a world-class "advanced light" science and technology team at JMAR over these
last 15 years has been a tremendously rewarding experience for me. I will miss
the close working relationships that have developed within the JMAR family over
that time as, together, we pushed forward the frontiers of advanced light
technology. I believe now is a good time for me to step-back, pass the baton and
let some of our younger folks, under a vigorous new leader, take over for the
next phase of the transition of our technology to commercialization."

"Fourteen years ago, our Collimated Plasma Lithography (CPL) program began at
JMAR Research, as little more than a concept for a new X-ray light source. Along
the way, we developed a leading-edge lithography light source technology and
acquired SAL/NanoLithography -- now called JMAR/SAL or JSAL, the world's most
experienced X-ray lithography stepper system company. Today, we are on the verge
of providing industry with a revolutionary next-generation system that will make
possible the cost-

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effective production of ever-smaller, more powerful semiconductors. This is a
tremendous accomplishment in which all of us here at JMAR can take a great deal
of pride.

"I am also very pleased to note that, although we have yet to fully finalize our
financials for the recently completed June 30, 2002 quarter, it is quite clear
that even with the shutdown of our chip business at JSI, we will be reporting a
dramatic increase in JMAR's sales revenue for that period," Dr. Martinez said.
"We estimate sales revenue in that quarter to be in excess of $6 million, which
makes it JMAR's strongest sales quarter since 1999. Sales in the 2002 quarter
are expected to be more than 80% greater than the comparable quarter last year,
and in excess of 30% higher than the first quarter of this year."

Speaking for JMAR's Outside Board Members, Vernon Blackman, Ph.D. added, "We
wish to thank Jack for the outstanding leadership he has given JMAR over the
years. His dedication, vision and drive have been key as the Company grew from a
small laser manufacturer into one of the world's leading developers of
next-generation lithography solutions."

Martinez concluded, "Finally, I wish to extend my warmest personal thanks to all
JMAR management and employees, whose commitment and hard work have been the
driving force behind JMAR's growth over the years and whose camaraderie have
made my time at the Company so rewarding. I also wish to thank our loyal
shareholders for their patience, their enthusiasm and their support, and the
JMAR Board of Directors for their oversight of a very complex, high technology
business with great upside potential."

JMAR Technologies, Inc., is the world's leading developer and manufacturer of
collimated laser plasma lithography sources and systems and X-ray lithography
stepper systems for the semiconductor industry and is a leading developer of
proprietary advanced laser, one nanometer and EUV light sources for other
high-value microelectronics applications. In addition, JMAR provides
semiconductor process technologies and services and manufactures precision
measurement, positioning and light-based manufacturing systems for inspection,
repair and fabrication of semiconductors, data storage devices, biomedical and
optical communications products.

The statements herein regarding JMAR's expectations for future sales and
potential business opportunities are forward-looking statements based on current
expectations that are subject to risks and uncertainties that could cause actual
results to differ materially from those set forth in the forward-looking
statements. These risks include the failure of future orders to materialize as
expected, delays in development, shipment or production, parts and labor
shortages, cancellation or re-scheduling of orders, the inability to obtain
financing when required on terms acceptable to the Company, delays in funding of
third-party contracts, including the funding of U.S. Government contracts, and
the other risks detailed in the company's 2001 Form 10-K and other reports filed
with the SEC.

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