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. 20, 2007
Filed:
Oct. 26, 2004
Applicant:
Ken Fujita, Tokyo, JP;
Inventor:
Ken Fujita, Tokyo, JP;
Assignee:
Oki Electric Industry Co., Ltd., Tokyo, JP;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03L 7/181 (2006.01); H03L 7/097 (2006.01);
U.S. Cl.
CPC ...
Abstract
A local oscillator circuit has a control loop that locks the oscillation of a voltage-controlled oscillator at a programmable frequency. The control loop includes a voltage generator that generates a control voltage for the voltage-controlled oscillator, and a current generator that generates a current to raise and lower the control voltage. The magnitude of the current is switched according to the programmed frequency. The magnitude of the current can thereby be adjusted so that the local oscillator circuit achieves lock within a predetermined time, without the need for analog comparison of the control voltage.