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. 17, 2009
Filed:
Nov. 06, 2006
Applicants:
Masumi Kasahara, Kodaira, JP;
Hirotaka Osawa, Kodaira, JP;
Robert Astle Henshaw, Royston, GB;
Inventors:
Assignees:
Renesas Technology Corp., Tokyo, JP;
TTPCom Limited, Hertfordshire, GB;
Primary Examiner:
Int. Cl.
CPC ...
H03B 1/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a communication semiconductor integrated circuit device, an oscillator of a PLL circuit can operate in a plurality of frequency bands. With a control voltage (Vc) of the oscillator fixed to a predetermined value (VDC), an oscillation frequency of the oscillator is measured for each band to be stored in a storage. When the PLL operates, a setting value to specify a band is compared with the measured frequency values stored in the storage. As a result of the comparison, a band to be actually used by the oscillator is determined.