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:
Feb. 19, 2008
Filed:
Dec. 30, 2004
Hiroki Sugiyama, Takasaki, JP;
Takashi Soga, Takasaki, JP;
Yusuke Shimamune, Takasaki, JP;
Shuji Tomono, Saku, JP;
Tomio Furuya, Tamamura, JP;
Kyoichi Takahashi, Fujioka, JP;
Hiroki Sugiyama, Takasaki, JP;
Takashi Soga, Takasaki, JP;
Yusuke Shimamune, Takasaki, JP;
Shuji Tomono, Saku, JP;
Tomio Furuya, Tamamura, JP;
Kyoichi Takahashi, Fujioka, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
The present invention provides a high frequency power amplifier circuit capable of obtaining sufficient detection output even in a range where a request output power level is low and performing a desired output power control by a control loop with the detection output in a radio communication system which detects output power and performs feedback control. An output power detection circuit which detects the level of output power on the basis of an AC signal supplied from a final amplification stage of a high frequency power amplification circuit via a capacitive element has a circuit configuration such that in a state where the output power control voltage is lower than a certain level, current (Isu) according to the output power control voltage is generated and supplied to the output power detection circuit, and detection sensitivity of the output power detection circuit improves according to the current.