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:
Apr. 29, 2003
Filed:
Dec. 18, 2000
Applicant:
Inventor:
Tirdad Sowlati, Ossining, NY (US);
Assignee:
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 3/04 ; H03F 3/26 ;
U.S. Cl.
CPC ...
H03F 3/04 ; H03F 3/26 ;
Abstract
A power amplifier circuit includes an amplifying transistor and a dc bias circuit for biasing the amplifying transistor to obtain a conduction angle of less than about 180°. The dc bias circuit includes a dynamic biasing circuit for decreasing the dc bias signal provided to the amplifying transistor as the input signal to the power amplifier circuit increases. This configuration permits the amplifier circuit to operate as a linearized Class C amplifier, having a substantially linear input-output relationship similar to that of a Class B amplifier, but with increased operating efficiency.