Phase-locked loop with variable gain and bandwidth

Details Phase-locked loop with variable gain and bandwidth Phase-locked loop with variable gain and bandwidth

1978-01-26

1979-05-29

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 17, 331 27, H03B 304

Patent

active

041568559

ABSTRACT:
A phase locked loop includes a voltage-controlled oscillator, and a phase and frequency detector for comprising an input signal pulse wave with a pulse wave from the voltage-controlled oscillator, and for providing a frequency control voltage to the voltage-controlled oscillator. When the pulses overlap, a pulse comparison circuit in the phase and frequency detector produces a frequency "up" signal or a frequency "down" signal proportional to the correction necessary. When the pulses do not overlap, the pulse comparison circuit produces a "non-overlap" signal which effects a rapid frequency correction by causing a current pump in the phase and frequency detector to increase its output to a fixed maximum value, and by causing a loop filter to increase its bandwidth to a fixed maximum value.

REFERENCES:
patent: 3316497 (1967-04-01), Brooks
patent: 3694776 (1972-09-01), Linder
patent: 3993958 (1976-11-01), Cutsogeorge
patent: 4053933 (1977-10-01), Collins

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