Sperry Rand Corporation

Randall L Sandusky

Charles E Mendenhall

A phase comparator for a digital phase locked loop which provides first and second order error signals for phase and frequency correction of a voltage controlled oscillator in the loop with respect to data being read for self synchronization of the data. A first order error signal is generated in a first phase detector which operates only during a VCO 'unsafe' condition, i.e., when a data pulse is beyond a present limit. A finer, second order error signal is generated in a second phase detector which operates only during a VCO 'safe' condition, i.e., when a data pulse is within a preset limit.

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San Jose, CA, United States of America

Randall L Sandusky