PLL with lock up detector and lock acquisition circuit

Details PLL with lock up detector and lock acquisition circuit PLL with lock up detector and lock acquisition circuit

1984-07-13

1986-06-24

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

331 25, 331DIG2, H03L 706

Patent

active

045969639

ABSTRACT:
A phase lock loop circuit comprises a variable frequency oscillator having a control input and an output, a divider having an input coupled with the output of the oscillator and an output coupled with the first input of a phase or frequency comparator. The comparator has a second input for a reference frequency (F.sub.REF) and an output coupled with the oscillator control input for providing a signal which is related to the difference in phase or frequency of the signals at the first and second inputs to effect phase locking of the oscillator to the reference signal. A detector provides a switching signal when the control signal falls outside a predetermined range and a switch in the phase lock loop is responsive to the switching signal to open the loop.

REFERENCES:
patent: 4135166 (1979-01-01), Marchetti
patent: 4365211 (1982-12-01), Lee
patent: 4423390 (1983-12-01), Waters
patent: 4484152 (1984-11-01), Lee
Blanchard, A. "Phase-Locked Loops Application to Coherent Receiver Design" John Wiley and Sons, N.Y., 1976, pp. 280-289.

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