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:
Mar. 04, 2008
Filed:
Jul. 13, 2005
Masao Nakayama, Ritto, JP;
Tsunehiro Takagi, Nagaokakyo, JP;
Masahiko Inamori, Ibaraki, JP;
Kaname Motoyoshi, Nishinomiya, JP;
Masao Nakayama, Ritto, JP;
Tsunehiro Takagi, Nagaokakyo, JP;
Masahiko Inamori, Ibaraki, JP;
Kaname Motoyoshi, Nishinomiya, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A gain control circuitcomprises an FEToperating as a variable resistor. A gate terminal of the FETis supplied with a control voltage VC applied to a gain control terminal. A source terminal and a drain terminal of the FETare supplied with a reference voltage Vrefobtained by a reference voltage circuit. The reference voltage Vrefis controlled so as to compensate for a variation in the threshold voltage of the FET. The resistance value of the FETis changed in accordance with the control voltage VC, and thus the gain of the high frequency amplification circuitis also continuously changed.