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:
Nov. 17, 2009
Filed:
Sep. 27, 2005
David William Boerstler, Round Rock, TX (US);
Matthew E. Fernsler, Round Rock, TX (US);
Eskinder Hailu, Austin, TX (US);
Jieming Qi, Austin, TX (US);
Mack Wayne Riley, Austin, TX (US);
David William Boerstler, Round Rock, TX (US);
Matthew E. Fernsler, Round Rock, TX (US);
Eskinder Hailu, Austin, TX (US);
Jieming Qi, Austin, TX (US);
Mack Wayne Riley, Austin, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A frequency synthesizer lock detection system is disclosed that distributes a frequency synthesizer output signal across a distribution network to one or more receptor circuits. The distribution network may exhibit delay and other distortion that may cause the downstream signal arriving at the receptor circuit to lose frequency lock with both the frequency synthesizer output signal and a reference clock signal that controls the frequency of the synthesizer output signal. The lock detection system tests the downstream signal to determine if the downstream signal exhibits a lock with respect to the reference clock that determines the operating frequency of the frequency synthesizer. In this manner, lock of the downstream signal to the reference clock signal may be accurately assessed in one embodiment.