Anti-latching mechanism for phase lock loops

Details Anti-latching mechanism for phase lock loops Anti-latching mechanism for phase lock loops

1996-01-29

1997-12-02

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 14, 331 17, 331 25, H03L 7093

Patent

active

056940874

ABSTRACT:
A protective circuit for a phase lock loop ensures that the VCO does not initiate a runaway condition when outputting a signal having a frequency higher than the feedback divider can respond to. During normal phase lock operation, a counter keeps track of the PLL input signal and is reset by the feedback divider. In the runaway condition the counter is not reset and triggers a control signal to the VCO. A second counter can be used to keep track of the feedback divider output and to reset the first counter. When the first counter far outruns the second counter the control signal is triggered.

REFERENCES:
patent: 5208555 (1993-05-01), Graham et al.

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