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:
Jan. 22, 2013
Filed:
Aug. 24, 2009
Hyeon Min Bae, Champaign, IL (US);
Naresh Ramnath Shanbhag, Champaign, IL (US);
Andrew C. Singer, Champaign, IL (US);
Hyeon Min Bae, Champaign, IL (US);
Naresh Ramnath Shanbhag, Champaign, IL (US);
Andrew C. Singer, Champaign, IL (US);
Finisar Corporation, Sunnyvale, CA (US);
Abstract
An example method includes receiving a phase correction signal representing a phase difference between a source signal and a reference signal, generating a first control voltage from the phase correction signal using a charge pump circuit, generating a second control voltage from the phase correction signal in response to a digitally filtered version of the phase correction signal, wherein the second control voltage corrects for an offset error present in the first control voltage, calculating a VCO control signal based on a linear combination of the first and the second control voltages; and generating the source signal in response to the VCO control signal.