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LOCK INDICATOR CIRCUIT Disclosure Number: IPCOM000006191D
Original Publication Date: 1991-Jul-01
Included in the Prior Art Database: 2001-Dec-12

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Wayne Shepherd


Once the lock range of a phase detector is exceeded, an A-C signal equal to the difference fre- quency is generated. A counter can be used to count the A-C signal which generates an output (unlock) once a specific value has been reached.