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:
Apr. 22, 2003
Filed:
Feb. 05, 2001
Kal Shastri, Orefield, PA (US);
PMC Sierra, Inc., British Columbia, CA;
Abstract
A multi-channel clock recovery circuit is provided that generates pairs of recovered half-speed clocks. Each pair of half-speed clocks has a relative phase relationship of 180° and are capable of registering input data of a data channel at the eye of the input data. The multi-phase clock recovery circuit includes a voltage controlled oscillator outputting a plurality of half-speed reference clocks. Each of a plurality of clock recovery circuits include a phase locked loop having a phase multiplexor, the phase multiplexor receiving the plurality of half-speed reference clocks and selectively outputting four recovered half-speed clocks each having a half-speed frequency relative to the input data. The four recovered clocks are used as a feedback reference clocks in the phase locked loop and two of the four recovered half-speed clocks are used to synchronize input data.