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. 10, 2016
Filed:
Oct. 22, 2015
International Business Machines Corporation, Armonk, NY (US);
Herschel A. Ainspan, New Hempstead, NY (US);
Mark A. Ferriss, Tarrytown, NY (US);
Daniel J. Friedman, Sleepy Hollow, NY (US);
Alexander V. Rylyakov, Mount Kisco, NY (US);
Bodhisatwa Sadhu, White Plains, NY (US);
Alberto Valdes Garcia, Hartsdale, NY (US);
INTERNATIONAL BUSINESS MACHINES CORPORATION, Armonk, NY (US);
Abstract
Methods and devices for phase adjustment include a phase detector that is configured to compare a reference clock and a feedback clock and to generate two output signals. A difference in time between pulse widths of the two output signals corresponds to a phase difference between the reference clock and the feedback clock. A programmable delay line is configured to delay an earlier output signal in accordance with a predicted deterministic phase error. An oscillator is configured to generate a feedback signal in accordance with the delayed output signal. A divider is configured to divide a frequency of the oscillator output by an integer N. The integer N is varied to achieve an average fractional divide ratio and the predicted deterministic phase error is based on the average divide ratio and an instantaneous divide ratio.