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:
Dec. 29, 2009
Filed:
Jun. 07, 2007
Masao Nakayama, Shiga, JP;
Hiroshi Sugiyama, Osaka, JP;
Kazuhiko Oohashi, Kyoto, JP;
Kouki Yamamoto, Shiga, JP;
Kaname Motoyoshi, Hyogo, JP;
Masao Nakayama, Shiga, JP;
Hiroshi Sugiyama, Osaka, JP;
Kazuhiko Oohashi, Kyoto, JP;
Kouki Yamamoto, Shiga, JP;
Kaname Motoyoshi, Hyogo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A bias circuitincludes: a transistor Qoperable to supply, to an amplifier, a bias current in accordance with a base current supplied thereto; a transistor Qoperable to pass a current in accordance with a reference voltage Vref; a transistor Qoperable to correct, in accordance with the current passed by the transistor Q, the base current to be supplied to the transistor Q, so as to compensate a temperature characteristic represented by the transistor Q; and a bias changing section (of a transistor Q, and resistances R, R, and R), connected to a base of the transistor Q, operable to change, in accordance with a control voltage VSW, an amount of the base current to be supplied to the transistor Q. The amplifieramplifies, by using the bias current supplied by the bias circuit, a radio frequency signal having been inputted thereto.