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:
Jul. 08, 2003
Filed:
Feb. 11, 1999
Lance Alan Marten, Gilbert, AZ (US);
William H. Gulliver, Gilbert, AZ (US);
Bradley Michael Wemhaner, Chandler, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A Phase Locked Loop system ( ) provides the signals UP and DOWN for a charge pump ( ). The charge pump ( ) supplies a biasing signal to a voltage controlled oscillator ( ). The phase and frequency relationship between a feedback signal from the voltage controlled oscillator ( ) and a clock signal are used by a compensating phase-frequency detector ( ) to generate the signals UP and DOWN. The pulse width of the signal DOWN is limited when a transition of the clock signal is missed. An error detector ( ) provides a signal BADCLK after detecting that multiple transitions of the clock signal have been missed. The signal BADCLK generates the signal UP having a pulse width that compensates for the last signal DOWN and keeps the biasing signal to the voltage controlled oscillator ( ) relatively constant when the clock signal fails.