Document:

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                                                                   Exhibit 10.15

                     INSTRUMENT OF ASSUMPTION OF LIABILITIES

      This Instrument of Assumption of Liabilities dated as of May 18, 1998, is
made by Intrinsix Corp., a Massachusetts corporation (the "Buyer"), in favor of
Prism Acoustics, Inc. (d/b/a The VHDL Technology Group), a Delaware corporation
(the "Seller"). All capitalized words and terms used in this Instrument of
Assumption of Liabilities and not defined herein shall have the respective
meanings ascribed to them in the Asset Purchase Agreement dated as of May 18,
1998 among the Seller, William D. Billowitch, the sole stockholder of Seller
(the "Stockholder") and the Buyer (the "Agreement").

      WHEREAS, pursuant to the Agreement, the Seller has agreed to sell,
transfer, convey, assign and deliver to the Buyer substantially all of the
assets and business of the Seller;

      WHEREAS, in partial consideration therefor, the Agreement requires the
Buyer to assume certain of the liabilities of the Seller;

      NOW, THEREFORE, for other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the Buyer hereby agrees as
follows:

      1. The Buyer hereby assumes and agrees to perform, pay and discharge the
Assumed Liabilities specifically set forth in Schedule 1.4 attached to the
Agreement, which Schedule 1.4 is incorporated by reference herein.

      2. Notwithstanding the foregoing, the Buyer does not hereby assume or
agree to perform, pay or discharge, and the Seller and Stockholder shall remain
unconditionally liable for, from and after the date hereof, all of the Retained
Liabilities.

      3. Nothing contained herein shall require the Buyer to perform, pay or
discharge any liability, obligation or commitment expressly assumed by the Buyer
herein so long as the Buyer in good faith contests or causes to be contested the
amount or validity thereof.

      4. Nothing herein shall be deemed to deprive the Buyer of any defenses,
set-offs or counterclaims which the Seller or Stockholder may have had or which
the Buyer shall have with respect to any of the Assumed Liabilities (the
"Defenses and Claims"). The Seller and Stockholder hereby transfer, convey and
assign to the Buyer all Defenses and Claims and agree to cooperate with the
Buyer to maintain, secure, perfect and enforce such Defenses and Claims,
including the signing of any documents, the giving of any testimony or the
taking of any such other action as is reasonably requested by the Buyer in
connection with such Defenses and Claims.

      5. It is expressly understood and agreed that all Retained Liabilities
shall remain, as between the Buyer on the one hand and the Seller and
Stockholder on the other hand, the sole obligation of the Seller and Stockholder
and their respective successors and assigns.
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      6. The Buyer, by its execution of this Instrument of Assumption of
Liabilities, and the Seller and Stockholder, by their acceptance of this
Instrument of Assumption of Liabilities, each hereby acknowledges and agrees
that neither the representations and warranties nor the rights and remedies of
any Party under the Agreement shall be deemed to be enlarged, modified or
altered in any way by such execution and acceptance of this instrument.

      IN WITNESS WHEREOF, the Buyer, the Seller and the Stockholder have caused
this instrument to be duly executed under seal as of and on the date first above
written.

                                     BUYER:

                                     INTRINSIX CORP.

                                     By: /s/ Jim Gobes
                                         -------------------------
                                         James A. Gobes

                                     Title: President

Agreed and Accepted:

SELLER:

PRISM ACOUSTICS, INC.

By: /s/ William D. Billowitch
    ----------------------------
    William D. Billowitch

Title: President

STOCKHOLDER:

/s/ William D. Billowitch
---------------------------------
William D. Billowitch

                                     - 2 -<PAGE>

                                                                   Exhibit 10.16

                              TRADEMARK ASSIGNMENT

      Prism Acoustics, Inc. (d/b/a The VHDL Technology Group), a Delaware
corporation, having its principal place of business at 100 Brodhead Street,
Suite 140, Bethlehem, Pennsylvania 18017 (the "Seller"), for good and valuable
consideration, the receipt of which is hereby acknowledged, hereby assigns and
delivers to Intrinsix Corp., a Massachusetts corporation having its principal
place of business at 33 Lyman Street, Westboro, Massachusetts 01581 (the
"Buyer"), its entire right, title and interest in and to each of the trademarks,
service marks, trade names, service marks, registrations and applications for
registrations used in the business of the Seller, including, without limitation,
the trademarks set forth herein, including all goodwill associated therewith,
together with the entire right, title and interest in and to any and all causes
of action for infringement thereof, including the right to recover for past
infringement, and the same to be held and enjoyed by the Buyer, its successors
and assigns.

                                   TRADEMARKS

                                      Prism
                                 Prism Acoustics
                                      VHDL
                         Designers' Introduction to VHDL
                                    Dragster
                                  Dragster-Pro

      Each of the Seller and William D. Billowitch, the sole stockholder of the
Seller (the "Stockholder"), further agrees, for itself, its successors and
assigns, to execute such further documents and to perform such further lawful
acts as may reasonably be requested by the Buyer to effectuate this assignment.
<PAGE>

      Witness my hand this 18th day of May, 1998.

                                    SELLER:

                                    PRISM ACOUSTICS, INC.

                                    By: /s/ William D. Billowitch
                                        --------------------------------
                                        William D. Billowitch

                                    Title: President

                                    STOCKHOLDER:

                                    /s/ William D. Billowitch
                                    ------------------------------------
                                    William D. Billowitch

                                     - 2 -<PAGE>

                                                                   Exhibit 10.17

                                  BILL OF SALE

      This Bill of Sale dated as of December 29, 1999, is executed and delivered
by Telexis Corp., a corporation continued under the laws of Canada (the
"Seller"), to Intrinsix Canada Co., a Nova Scotia unlimited company (the
"Buyer"). All capitalized words and terms used in this Bill of Sale and not
defined herein shall have the respective meanings ascribed to them in the Asset
Purchase Agreement dated as of December 29, 1999, by and among the Seller and
the Buyer (the "Agreement").

      WHEREAS, pursuant to the Agreement, the Buyer desires to purchase, and the
Seller desires to sell, substantially all of the assets and business of the
Seller's Business referred to in the Agreement for the consideration set forth
in the Agreement, subject to the terms and conditions of the Agreement;

      NOW, THEREFORE, in consideration of the mutual promises set forth in the
Agreement and other good and valuable consideration, the receipt of which is
hereby acknowledged, the Seller hereby agrees as follows:

      1. The Seller hereby sells, transfers, conveys, assigns and delivers to
the Buyer, its successors and assigns, to have and to hold forever, all of the
Assets.

      2. The Seller hereby covenants and agrees that it will, at the request of
the Buyer and without further consideration, execute and deliver, and will cause
its employees to execute and deliver, such other instruments of sale, transfer,
conveyance and assignment, and take such other action, as may reasonably be
necessary to more effectively sell, transfer, convey, assign and deliver to, and
vest in, the Buyer, its successors and assigns, good, clear and marketable title
to the Assets, and to put the Buyer in actual possession and operating control
thereof, to assist the Buyer in exercising all rights with respect thereto and
to carry out the purpose and intent of the Agreement.

      3. The Seller does hereby irrevocably constitute and appoint the Buyer,
its successors and assigns, its true and lawful attorney, with full power of
substitution, in its name or otherwise, and on behalf of the Seller, or for its
own use, to claim, demand, collect and receive at any time and from time to time
any and all of the Assets, and to prosecute the same at law or in equity and,
upon discharge thereof, to complete, execute and deliver any and all necessary
instruments of satisfaction and release.

      4. The Seller, by its execution of this Bill of Sale, and the Buyer, by
its acceptance of this Bill of Sale, each hereby acknowledges and agrees that
neither the representations and warranties nor the rights and remedies of any
party under the Agreement shall be deemed to be enlarged, modified or altered in
any way by this instrument.

      5. Nothing in this Bill of Sale shall be construed as an attempt to assign
to the Buyer any Contract Rights which would otherwise be Assets where:
<PAGE>

      (a) any such Contract Right which, as a matter of law or by the terms
thereof, is not assignable without the consent of the party or parties to such
Contract Right and in respect of which no such consent has been given; or

      (b) any claim or demand as to which all of the remedies for the
enforcement thereof enjoyed by a Seller would not as a matter of law pass to the
Buyer as in incident of the transfer to be made under this Bill of Sale;

and the Seller hereby declares that it shall hold such Contract Rights as bare
trustee for the benefit of the Buyer, provided, however, that upon any consent
referred to in subsection (a) being obtained, all Contract Rights to which such
consent relates shall forthwith pass to the Buyer without any further or other
formality. In respect of the foregoing, the Seller shall take or cause to be
taken such action in its name or otherwise as the Buyer may require so as to
provide the Buyer with all of the benefits of the Contract Rights and to effect
collection of money to become due and payable by the other party to the Assumed
Contracts and the Seller shall promptly pay over to the Buyer all money received
by the Seller in respect of all of the foregoing. The Seller hereby authorizes
the Buyer to perform all of the Seller's obligations under the Assumed Contracts
and constitutes the Buyer its attorney to act in the name of the Seller with
respect thereto.

      IN WITNESS WHEREOF, the Seller and the Buyer have caused this instrument
to be duly executed under seal as of the date first above written.

                                    TELEXIS CORP.

                                    By: /s/ Andre Rancourt
                                        ------------------------------------

[Corporate Seal]                    Title: Vice-President Finance and CFO
                                           ---------------------------------

                                    By: /s/ David Rothwell
                                        ------------------------------------

                                    Title: VP & GM
                                           ---------------------------------

ATTEST:

/s/ Brian Meeks
---------------------------

ACCEPTED:

INTRINSIX CANADA CO.

By: /s/ Jim Gobes
    -----------------------

Title: President
       --------------------

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