Lock recovery circuit for a phase locked loop

Details Lock recovery circuit for a phase locked loop Lock recovery circuit for a phase locked loop

1993-06-01

1994-04-19

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 8, 331 17, 331 25, 331DIG2, H03L 7095, H03L 710

Patent

active

053049535

ABSTRACT:
A circuit (10) for providing recovery of a phase locked loop circuit when lock has been lost has been provided. The circuit includes a lock indicator circuit (24) for detecting when the phase locked loop circuit has lost lock on an input reference signal. When such loss has occurred, an override circuit (28) is rendered operative to decrease the voltage appearing at the input of a VCO within the phase locked loop thereby slowing down the frequency of the VCO and allowing the phase locked loop circuit to recover lock. Further, a logic circuit (30) detects when the voltage appearing at the input of the VCO has fallen below a predetermined threshold voltage and renders the override circuit non-operative.

REFERENCES:
patent: 4940951 (1990-07-01), Sakamoto
patent: 5008635 (1991-04-01), Hanke et al.

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