System to verify phase lock of a phase lock loop

Details System to verify phase lock of a phase lock loop System to verify phase lock of a phase lock loop

1987-08-24

1989-09-12

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 25, 331DIG2, H03L 708

Patent

active

048664022

ABSTRACT:
Apparatus and method for verifying the lock state or lock condition of a phase locked loop that includes a phase detector, a loop filter and a voltage controlled oscillator. The apparatus comprises a second oscillator that provides a signal of predetermined frequency to the loop filter and a second phase detector providing an output signal indicative of phase lock status. According to the method a signal of predetermined frequency is input to the loop filter and to a second phase detector. The presence of signals to the predetermined frequency is detected at the output of the loop phase detector by inputing the output from the loop phase detector to the second phase detector.

REFERENCES:
patent: 4316154 (1982-02-01), Krause
EXAR Databook, EXAR Corp., Sunnyvale, Calif., Apr. 1986, pp. 1-38 to 1-52.

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