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:
Apr. 22, 2008
Filed:
Feb. 20, 2007
Hiroshi Komurasaki, Hyogo, JP;
Tomohiro Sano, Hyogo, JP;
Hisayasu Sato, Hyogo, JP;
Toshio Kumamoto, Hyogo, JP;
Yasushi Hashizume, Hyogo, JP;
Hiroshi Komurasaki, Hyogo, JP;
Tomohiro Sano, Hyogo, JP;
Hisayasu Sato, Hyogo, JP;
Toshio Kumamoto, Hyogo, JP;
Yasushi Hashizume, Hyogo, JP;
Renesas Technology Corp., Chiyoda-Ku, Tokyo, JP;
Abstract
An oscillator circuit is formed of a differential LC resonant circuit formed of an L load differential circuit including inductance-variable portions and a capacitor element, and a positive feedback circuit formed of N-channel MOS transistors. The inductance-variable portion is configured to vary the inductance by selecting a plurality of switch circuits arranged between a plurality of arbitrary positions on a spiral interconnection layer and the input/output terminal, and thereby can control an oscillation frequency. The inductance-variable portions form an inductor pair when the switch circuit among the switch circuits coupled between the first input/output terminals is turned on together with the switch circuit.