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. 06, 2008
Filed:
Feb. 27, 2006
Shigeo Masai, Sagamihara, JP;
Yuichi Tateyama, Sagamihara, JP;
Takashi Otsuka, Yokohama, JP;
Hisato Takeuchi, Yokohama, JP;
Shigeo Masai, Sagamihara, JP;
Yuichi Tateyama, Sagamihara, JP;
Takashi Otsuka, Yokohama, JP;
Hisato Takeuchi, Yokohama, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
To provide a MOS varactor in which oscillation frequency variation is small and variation in a capacitance changing voltage is small, and a voltage-controlled oscillator using the MOS varactor, as a load capacitor of an oscillating circuit composed of a feedback resistor, an amplifier, and a crystal vibrator, a variable electrostatic capacitor, which is generated between drain/source terminals and a gate terminal of each of MOS transistorsandeach of which source and drain terminals are short-circuited, is connected. A bulk terminal of each of the MOS transistorsandis connected to one terminal of a resistor, a voltage is applied to the other terminal of the resistor, the bulk terminal of each of the MOS transistorsandis connected to one terminal of a capacitor, and the other terminal of the capacitoris grounded.