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:
Oct. 13, 2009
Filed:
Jul. 12, 2006
Applicant:
Kazuhisa Ishiguro, Gunma, JP;
Inventor:
Kazuhisa Ishiguro, Gunma, JP;
Assignees:
Niigata Seimitsu Co., Ltd., Jyoetsu-shi, JP;
Ricoh Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03F 3/45 (2006.01);
U.S. Cl.
CPC ...
Abstract
An idling current setting circuit () includes: current setting transistors (Q, Q) connected to output transistors (Q, Q) in a driver () in current mirror form; a plurality of current setting resistors (Rto R); and a plurality of switches (ASWto ASW) for switching to any of the current setting resistors (Rto R). This enables the idling current to be set by the current mirror ratio between the current setting transistors (Q, Q) having no connection with the open gain of the power amplifier and the output transistors (Q, Q), so that the idling current can be arbitrarily set independently of the open gain.