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:
Aug. 21, 2012
Filed:
Nov. 18, 2010
Applicants:
Hanan Cohen, San Diego, CA (US);
Simon Pang, San Diego, CA (US);
Inventors:
Hanan Cohen, San Diego, CA (US);
Simon Pang, San Diego, CA (US);
Assignee:
Applied Micro Circuits Corporation, San Diego, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
G01R 23/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A system and method are provided for frequency lock detection using a digital phase error. A lock detection module accepts a digital phase error (pherr) message proportional to an error in phase between a reference clock and a (synthesizer clock*Nf). Also accepted is a unitless frequency error tolerance value (Δf). The lock detection module periodically supplies a lock detect signal, indicating whether the synthesizer clock frequency is within the frequency error tolerance value of the reference clock frequency.