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:
Sep. 19, 2000
Filed:
Aug. 27, 1997
Applicant:
Inventor:
Keiichi Sakuno, Nara, JP;
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03G / ; H03F / ;
U.S. Cl.
CPC ...
330285 ; 330302 ;
Abstract
In a transistor power amplifier, a base of a power amplifying bipolar transistor is connected with a gain control power source via a bias resistor. The power amplifying transistor is directly biased from the gain control power source via the bias resistor, and not via a base driving bipolar transistor so as to widen an effective gain control voltage range by an amount corresponding to an ON-state voltage across a base and emitter of the base driving bipolar transistor.