Kerry L Burger

US Patent:

20020067209, Jun 6, 2002

Filed:

Dec 6, 2000

Appl. No.:

09/730657

Inventors:

Sifen Luo - Hartsdale NY, US
Tirdad Sowlati - Ossining NY, US
Chris Joly - North Providence RI, US
Kerry Burger - Lincoln NE, US

Assignee:

Philips Electronics North America Corporation

International Classification:

H03F003/04

US Classification:

330/296000

Abstract:

A power amplifier circuit includes an amplifying transistor and a dc bias circuit for biasing the amplifier transistor to obtain a conduction angle of at least about 180. The dc bias circuit includes a self-bias boosting circuit for initially decreasing and then increasing the dc bias voltage provided to a control terminal of the amplifying transistor by the dc bias circuit as the input signal provided to the power amplifier increases. The self-bias boosting circuit is extremely simple and compact in design, and permits the power amplifier circuits to operate in Class B or Class AB with improved power output characteristics.