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:
Jun. 14, 2005
Filed:
Sep. 25, 2002
Tomomitsu Kitamura, Takasaki, JP;
Yasuyuki Kimura, Maebashi, JP;
Ken Suyama, Mamaroneck, NY (US);
Aleksander Dec, Yonkers, NY (US);
Tomomitsu Kitamura, Takasaki, JP;
Yasuyuki Kimura, Maebashi, JP;
Ken Suyama, Mamaroneck, NY (US);
Aleksander Dec, Yonkers, NY (US);
Renesas Technology Corp., Tokyo, JP;
Epoch Microelectronics, Inc., White Plains, NY (US);
Abstract
A voltage controlled LC resonance oscillation circuit has a plurality of capacitive elements connected to an output node. These capacitive elements are applied with voltages at opposing terminals for selecting an oscillating frequency band, so that the oscillating frequency band can be changed step by step in accordance with the selection voltage. The capacitive elements include at least one variable capacitive element such as a MOS capacitor, the capacitance of which is varied in accordance with a voltage applied thereto. The MOS capacitor is similar in structure to a MOS transistor. The variable capacitive element can be supplied at a terminal opposite to the output node with a voltage from a variable voltage source, for example, in place of the selection voltage. The voltage controlled LC resonance oscillation circuit can measure the output amplitude and oscillating frequency without affecting the characteristics thereof, and reduce the parasitic capacitance.