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:
May. 17, 2011
Filed:
Apr. 13, 2009
Applicant:
Takayuki Tsukizawa, Osaka, JP;
Inventor:
Takayuki Tsukizawa, Osaka, JP;
Assignee:
Panasonic Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03B 5/18 (2006.01);
U.S. Cl.
CPC ...
Abstract
A voltage controlled oscillator includes an inductor circuit, C-coupling type variable capacitance circuits, a direct-coupling type variable capacitance circuit, and a negative resistance circuit, which are connected in parallel, and a reference voltage generating section that generates two reference voltages. A control voltage for feedback control of an oscillation frequency is applied to back gate terminals of variable capacitance elements of the variable capacitance circuits. The reference voltages are applied to gate terminals of the variable capacitance elements of the C-coupling type variable capacitance circuits, respectively.