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:
Oct. 12, 2010
Filed:
Dec. 11, 2008
Applicant:
Mohsen Moussavi, Kanata, CA;
Inventor:
Mohsen Moussavi, Kanata, CA;
Assignee:
Altera Corporation, San Jose, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R 23/00 (2006.01); H03L 7/06 (2006.01); H03L 7/099 (2006.01);
U.S. Cl.
CPC ...
Abstract
An apparatus includes phase detection circuitry that generates control signals in response to an input clock signal and a feedback clock signal. The apparatus also includes a clock signal generation circuit that includes fine and coarse capacitors. The clock signal generation circuit changes a capacitance of the capacitors that are affecting the output clock signal in response to a change in the control signals. The apparatus also includes measurement circuitry that determines a calibration number of the fine capacitors having a combined capacitance that most closely matches a capacitance of one of the coarse capacitors.