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:
May. 27, 2014
Filed:
Jan. 11, 2007
Applicants:
Woogeun Rhee, Beijing, CN;
Daniel J. Friedman, Sleepy Hollow, NY (US);
Inventors:
Woogeun Rhee, Beijing, CN;
Daniel J. Friedman, Sleepy Hollow, NY (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
H03L 7/06 (2006.01);
U.S. Cl.
CPC ...
Abstract
An apparatus includes a phase-locked loop (PLL) circuit including a phase-frequency detector configured to output phase error signals. A phase error monitor circuit is configured to determine instantaneous peak phase error by logically combining the phase error signals and comparing pulse widths of the logically combined phase error signals to a programmable delay time at each reference clock cycle to determine instantaneous phase error change. A storage element is configured to store the instantaneous phase error change.