Motorola Corporation

Bradley Michael Wemhaner

William H Gulliver

Lance Alan Marten

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.

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Chandler, AZ, United States of America

Bradley Michael Wemhaner