Phase-locked loop circuit

Details Phase-locked loop circuit Phase-locked loop circuit

2006-10-31

2006-10-31

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S074000, C331S175000

Reexamination Certificate

active

07129790

ABSTRACT:
A phase-locked loop circuit has an output amplifier (27) and a main feedback path from the output of the output amplifier (27). A subsidiary feedback path is provided directly from the output of the circuit's VCO (32). At the start of operation, the output amplifier (27) is disabled and the subsidiary feedback path is used until lock is achieved. Then the output amplifier (27) is enabled and the main feedback loop is used. This avoids spurious outputs from the outer amplifier while to loop locks.

REFERENCES:
patent: 5430416 (1995-07-01), Black et al.
patent: 5982233 (1999-11-01), Hellmark et al.
patent: 0 998 088 (2000-05-01), None
patent: 1 052 770 (2000-11-01), None

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