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. 03, 2001
Filed:
Mar. 18, 1998
Masayuki Hayashi, Sunnyvale, CA (US);
Robert J. Savaglio, Jericho, VT (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A shared path phase detector and phase indicator circuit provide a phase locked loop circuit for which loading and wiring dependencies are greatly reduced. The phase detector circuit is provided for receiving a reference clock and a second clock. The phase detector circuit provides a separate and unique signal for indicating the magnitude of the difference between the phase of the reference clock and the second clock, regardless of whether the second clock is leading or lagging the first clock. The phase indicator circuit detects whether the second clock is leading or lagging the first clock, and routes the pulses on a first internal signal path to generate either increment or decrement pulses depending on whether the second clock is lagging or leading, respectively. The generation of the increment and decrement pulses is also routed on the first internal signal path, which provides a phase locked loop circuit that does not require matched loading and custom wiring on the internal increment and the decrement paths as required in the prior art.