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:
Aug. 02, 2011
Filed:
Jul. 30, 2009
Haruhiko Koizumi, Osaka, JP;
Kaname Motoyoshi, Hyogo, JP;
Haruhiko Koizumi, Osaka, JP;
Kaname Motoyoshi, Hyogo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
Provided are a detector circuit which has a simple circuit configuration, is capable of indicating an accurate power according to a load fluctuation of a radio frequency power amplifier or a difference in a modulation mode, and can be easily incorporated in the radio frequency power amplifier, and a wireless communication system using the detector circuit. The detector circuitincludes a detecting resistorfor detecting a part of a current flowing from a bias circuit, and a current-voltage conversion circuitfor converting a current obtained through the detecting resistorinto a voltage. A current supplied from the bias circuitto the amplifying transistoris detected, so that an output current from the amplifying transistorfluctuates when a load on the radio frequency power amplifier fluctuates, and an input current and a current from the bias circuit fluctuate in proportion to the output current from the amplifying transistor, whereby an outputted detection voltage can follow a load fluctuation on the radio frequency power amplifier.