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. 19, 2002
Filed:
Jul. 19, 2001
Jonathan Lamb, Ringwood, GB;
Semtech Corporation, Newbury Park, CA (US);
Abstract
An improvement to a phase and frequency detector (PFD) employs an additional reset control that acts to effectively reset the registers that generate the phase indicator signals if an undesirable preconditioned state has been entered. The additional reset control signal is generated by a register that is enabled upon detection of the preconditioned state. The new reset control signal is activated upon detection of a synchronizing signal, that is based on an input source signal, while the enable control is active. The improved detector can allows a phase locked loop (PLL) system locking to the nearest input reference clock edge and it can provide immunity to missing input clock edges.