Exhibit 3.1

AMENDED AND RESTATED

CERTIFICATE OF INCORPORATION

OF

HITTITE MICROWAVE CORPORATION

FIRST: The name of the Corporation is: Hittite Microwave Corporation.

SECOND: The address of the Corporation’s registered office in the State of Delaware is Corporation Trust Center, 1209 Orange Street, in the City of Wilmington, County of New Castle, Delaware 19801. The name of its registered agent at such address is The Corporation Trust Company.

THIRD: The nature of the business or purposes to be conducted or promoted by the Corporation is to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of Delaware.

FOURTH: The total number of shares of stock which the Corporation shall have authority to issue is 1,000 shares of Common Stock, $0.001 par value per share.

The number of authorized shares of Common Stock may be increased or decreased (but not below the number of shares thereof then outstanding) by the affirmative vote of the holders of a majority of the stock of the Corporation entitled to vote, irrespective of the provisions of Section 242(b)(2) of the General Corporation Law of Delaware.

FIFTH: In furtherance of and not in limitation of powers conferred by statute, it is further provided: (i) the business and affairs of the Corporation shall be managed by or under the direction of the Board of Directors; (ii) election of directors need not be by written ballot; and (iii) the Board of Directors is expressly authorized to adopt, amend, alter or repeal the By-Laws of the Corporation.

SIXTH: To the maximum extent permitted by the General Corporation Law of Delaware as the same exists or may hereafter be amended, no director of the Corporation shall be personally liable to the Corporation or to any of its stockholders for monetary damages arising out of such director’s breach of fiduciary duty as a director of the Corporation. No amendment to or repeal of the provisions of this paragraph shall apply to or have any effect on the liability or the alleged liability of any director of the Corporation with respect to any act or failure to act of such director occurring prior to such amendment or repeal.

SEVENTH: The Corporation reserves the right to amend, alter, change or repeal any provision contained in this Amended and Restated Certificate of Incorporation, in the manner now or hereafter prescribed by statute and this Amended and Restated Certificate of Incorporation, and all rights conferred upon stockholders herein are granted subject to this reservation.