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:
Sep. 04, 2001
Filed:
May. 18, 1998
Brian Gaudet, San Jose, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A clock recovery architecture for recovering clock and serial data from an incoming data stream of a local area network station. A phase picker architecture augmented by a phase interpolator is used as part of the clock recovery architecture to enhance phase resolution. A single clock generation module (CGM) and N phase multiplexers, one for each clock recovery channel on a chip, is used to select one of M phases of a 250 Mhz clock signal from the CGM for each clock recovery channel. To provide the required phase resolution, a phase interpolator is used. The phase interpolator is used to create a number of delay steps evenly spaced between the gross phase steps of the phase multiplexer. Each phase multiplexer is advanced or retarded in response to the pump-up (pumpup) or pump-down (pumpdn) signals from each clock recovery channel (CRM).