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:
May. 25, 2004
Filed:
Jan. 08, 2003
Satoshi Arai, Komoro, JP;
Tsuyoshi Shibuya, Tokyo, JP;
Hitoshi Sekiguchi, Komoro, JP;
Nobuhiro Matsudaira, Chigasaki, JP;
Tomio Furuya, Tamamura, JP;
Masashi Maruyama, Komoro, JP;
Yasushi Ohyama, Komoro, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention provides a high frequency power amplifier of an open-loop type, which outputs a signal having a level corresponding to an output level required under control of a power supply voltage for each output power FET, based on a control signal for the output level. The high frequency power amplifier is provided with a bias voltage generating circuit which generates a gate bias voltage of each output power FET according to an output voltage of a power control circuit for controlling the power supply voltage for the output power FET, based on the control signal for the output level.