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. 09, 2010
Filed:
Mar. 07, 2005
Masaomi Tsuru, Tokyo, JP;
Kenji Kawakami, Tokyo, JP;
Kenichi Tajima, Tokyo, JP;
Moriyasu Miyazaki, Tokyo, JP;
Kazuhiro Miyamoto, Tokyo, JP;
Masafumi Nakane, Tokyo, JP;
Masaomi Tsuru, Tokyo, JP;
Kenji Kawakami, Tokyo, JP;
Kenichi Tajima, Tokyo, JP;
Moriyasu Miyazaki, Tokyo, JP;
Kazuhiro Miyamoto, Tokyo, JP;
Masafumi Nakane, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A voltage-controlled oscillator has a tuned circuit for controlling the oscillation frequency. The tuned circuit has a variable-capacitance element whose capacitance varies in response to a control voltage and a negative capacitance circuit whose impedance frequency characteristics have opposite characteristics to those of a normal capacitance, and which is connected to the variable-capacitance element. The configuration enables increasing the variation ratio corresponding to the control voltage of the combined capacitance composed of the variable-capacitance element and negative capacitance circuit, thereby broadening the oscillation frequency band.