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:
Jan. 29, 2008
Filed:
Jul. 07, 2005
Satoshi Suzuki, Tokyo, JP;
Takayuki Matsuzuka, Tokyo, JP;
Kenichiro Chomei, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A semiconductor device having an improved voltage control oscillator circuit is provided. The voltage control oscillator circuit includes, in combination, a variable-capacitance element and at least one bipolar transistor on a single semiconductor substrate. The variable-capacitance element includes reversely serially connected PN junctions, and junctions are formed by a single common collector layer and separated base layers on the common collector layer. The capacitance of the variable-capacitance element is generated between respective base layers of the PN junctions with the common collector layer, and varies in correspondence with the voltage applied to the common collector layer.