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, 2013
Filed:
Dec. 02, 2011
Akiko Mineyama, Kawasaki, JP;
Yoichi Kawano, Kawasaki, JP;
Toshihide Suzuki, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A differential amplifier circuit includes a first/second field effect transistor including a gate coupled to a first/second differential input signal terminal, a source coupled to a reference potential node, and a drain coupled to a first/second differential output signal terminal, a first variable capacitor coupled between the gate of the first field effect transistor and the drain of the second field effect transistor, a second variable capacitor coupled between the gate of the second field effect transistor and the drain of the first field effect transistor, and a first envelope detector configured to detect an envelope of a signal at the first differential output signal terminal or the second differential output signal terminal, the first variable capacitor and/or the second variable capacitor has a capacitance that varies in accordance with an envelope detected by the first envelope detector.