Exhibit 99.1

JOINT FILING AND SOLICITATION AGREEMENT

WHEREAS, certain of the undersigned are stockholders, direct or beneficial, of PLX Technology, Inc., a Delaware corporation (the “Company”);

WHEREAS, Balch Hill Partners, L.P., a Delaware limited partnership (the “Partnership”), Balch Hill Capital, LLC, a Delaware limited liability company (“Balch Hill”), Simon J. Michael, Martin Colombatto, Michael Cornwell, Robert R. Herb, Mark Schwartz, Dilip Singh and Bernard Xavier wish to form a group for the purpose of seeking representation on the Board of Directors of the Company (the “Board”) at the 2012 annual meeting of stockholders of the Company (including any other meeting of stockholders held in lieu thereof, and any adjournments, postponements, reschedulings or continuations thereof, the “2012 Annual Meeting”) and for the purpose of taking all other action necessary to achieve the foregoing.

NOW, IT IS AGREED, this 7th day of March 2012 by the parties hereto:

1.           In accordance with Rule 13d-1(k)(1)(iii) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), each of the undersigned (collectively, the “Group”) agrees to the joint filing on behalf of each of them of statements on Schedule 13D, and any amendments thereto, with respect to the securities of the Company.  Each member of the Group shall be responsible for the accuracy and completeness of his/its own disclosure therein, and is not responsible for the accuracy and completeness of the information concerning the other members, unless such member knows or has reason to know that such information is inaccurate.

2.           So long as this Agreement is in effect, each of the undersigned shall provide written notice to Olshan Grundman Frome Rosenzweig & Wolosky LLP (“Olshan”) of (i) any of their purchases or sales of securities of the Company, or (ii) any securities of the Company over which they acquire or dispose of beneficial ownership.  Notice shall be given no later than 24 hours after each such transaction.

3.           Each of the undersigned agrees to form the Group for the purpose of (i) soliciting proxies or written consents for the election of the persons nominated by the Partnership to the Board at the 2012 Annual Meeting, (ii) taking such other actions as the parties deem advisable, and (iii) taking all other action necessary or advisable to achieve the foregoing.

4.           The Partnership shall have the right to pre-approve all expenses incurred in connection with the Group’s activities set forth in Section 3 and agrees to pay directly all such pre-approved expenses.

5.           Each of the undersigned agrees that any SEC filing, press release or stockholder communication proposed to be made or issued by the Group or any member of the Group in connection with the Group’s activities set forth in Section 3 shall be first approved by Balch Hill or its representatives.

6.           The relationship of the parties hereto shall be limited to carrying on the business of the Group in accordance with the terms of this Agreement.  Such relationship shall be construed and deemed to be for the sole and limited purpose of carrying on such business as described herein.  Nothing herein shall be construed to authorize any party to act as an agent for any other party, or to create a joint venture or partnership, or to constitute an indemnification.  Nothing herein shall restrict any party’s right to purchase or sell securities of the Company, as he/it deems appropriate, in his/its sole discretion, provided that all such purchases and sales are made in compliance with all applicable securities laws.

7.           This Agreement may be executed in counterparts, each of which shall be deemed an original and all of which, taken together, shall constitute but one and the same instrument, which may be sufficiently evidenced by one counterpart.

8.           Any legal action or proceeding arising out of the provisions of this Agreement or the parties’ investment in the Company shall be brought and determined in any Delaware state court, or United States District Court sitting in the State of Delaware, and any appellate court thereof.

9.           Any party hereto may terminate his/its obligations under this Agreement on 24 hours’ prior written notice to all other parties, with a copy by fax to Steve Wolosky at Olshan, Fax No. (212) 451-2222.

10.           Each party acknowledges that Olshan shall act as counsel for both the Group and Balch Hill and its affiliates relating to their investment in the Company.

11.           Each of the undersigned hereby agrees that this Agreement shall be filed as an exhibit to a Schedule 13D pursuant to Rule 13d-1(k)(1)(iii) under the Exchange Act.

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IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed as of the day and year first above written.

Balch Hill Partners, L.P.
By:	Balch Hill Capital, LLC General Partner
By:		/s/ Simon J. Michael
		Name:	Simon J. Michael
		Title:	Manager

Balch Hill Capital, LLC
By:	/s/ Simon J. Michael
	Name:	Simon J. Michael
	Title:	Manager

/s/ Simon J. Michael

Simon J. Michael

/s/ Martin Colombatto

Martin Colombatto

/s/ Michael Cornwell

Michael Cornwell

/s/ Robert R. Herb

Robert R. Herb

/s/ Mark Schwartz

Mark Schwartz

/s/ Dilip Singh

Dilip Singh

/s/ Bernard Xavier

Bernard Xavier