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. 20, 1997
Filed:
Feb. 21, 1996
Applicant:
Inventors:
David C Chu, Woodside, CA (US);
Jeremy S Sommer, Los Altos, CA (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
375354 ; 375376 ;
Abstract
A master and a slave digital frequency synthesizer are phase-locked such that the master synthesizer is always selected to minimize the phase hits which occur when switching the master to be a slave and vice versa. The switching rearrangement is done automatically and rapidly in the event of failure of the master frequency synthesizer.