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:
Aug. 27, 2013
Filed:
Sep. 30, 2009
Applicants:
Satoshi Tanaka, Kanagawa, JP;
Fuminori Morisawa, Kanagawa, JP;
Makoto Tabei, Kanagawa, JP;
Inventors:
Assignee:
Murata Manufacturing Co., Ltd., Kyoto, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 3/04 (2006.01);
U.S. Cl.
CPC ...
Abstract
There is provided a bias circuit including a power amplifier in which influence of variation of a gate length L is reduced and variation of a gain among products is low. Two NPN- and PNP-type current mirror circuits(NPN type) and(PNP type) are inserted on an input side of a bias circuit. It is designed that a gate length of a transistor Qon an output side of the current mirror circuitis longer than that of the other transistor. In this manner, even when an error is generated, influence of the error can be suppressed to be small.