Duty cycle independent phase detector

Details Duty cycle independent phase detector Duty cycle independent phase detector

1987-04-15

1989-07-18

Miller, Stanley D.

Pulse or digital communications

Repeaters

Testing

328155, 375120, 307262, H03K 513, H03K 906, H03D 324

Patent

active

048497045

ABSTRACT:
A phase detecting circuit for use in phase-locked loops is provided with a pair of bistable circuits such as type D flip-flops. One of the circuits is clocked by a reference input signal and reset by the Q output of the other circuit. The other circuit is clocked by a second data signal and reset by the NOT Q output of the first circuit. The average value of the voltage appearing on the NOT Q output of the first circuit is proportional to the phase difference between the reference data signal and the second data signal.

REFERENCES:
patent: 4371974 (1983-02-01), Dugan
patent: 4422176 (1983-12-01), Summers
patent: 4574243 (1986-03-01), Levine
patent: 4635280 (1987-01-01), Smith et al.
patent: 4688094 (1987-08-01), Tanabe et al.

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