The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 11, 2002
Filed:
Dec. 04, 2000
William H. Davenport, Hillsboro, OR (US);
Tyler Bowman, Sherwood, OR (US);
TriQuint Semiconductor, Inc., Hillsboro, OR (US);
Abstract
A source-coupled oscillator contains two main MESFETs which supply current to respective loads and which have sources connected through a capacitor. Each of the main MESFETs is supplied with a constant current which can be adjusted to vary the frequency of the oscillator. The output signals are derived from the voltage across the loads. The oscillator also contains two differential pairs of MESFETs that change state as the main MESFETs are turned on and off and are connected so as to switch current into one or the other of the loads. Each of the differential pairs is supplied with a constant current. The currents supplied by the differential pairs act as compensating currents and are adjusted so that when the currents through the two main MESFETs are changed to vary the frequency of the oscillator, the total current through the loads remains constant. In this manner, the amplitude of the output signal can be maintained at a substantially constant level as the frequency of the oscillator is adjusted through a wide range.