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:
May. 06, 2008
Filed:
Aug. 24, 2005
Tomonori Tanoue, Machida, JP;
Masami Ohnishi, Hachioji, JP;
Hidetoshi Matsumoto, Kokubunji, JP;
Akira Kuriyama, Kokubunji, JP;
Tomonori Tanoue, Machida, JP;
Masami Ohnishi, Hachioji, JP;
Hidetoshi Matsumoto, Kokubunji, JP;
Akira Kuriyama, Kokubunji, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
Disclosed is a power amplifier having highly stable and excellent controllability, and having low noise in comparison with conventional power amplifiers. With the power amplifier, a differential amplifier made up of transistors Q, Qis provided in the initial stage thereof, and baluns doubling as inter-stage matching circuits, comprised of Cp, Cp, Lp, and Ct, Ct, Lt, respectively, are provided between the initial stage, and a second stage while an unbalanced single-ended circuit is provided in the second stage. The differential amplifier has an emitter-coupled type configuration for coupling both emitters with each other, and output control of the amplifier in the initial stage is executed by varying current of a current source coupled to both the emitters.