Frequency locked loop with constant loop gain and frequency diff

Details Frequency locked loop with constant loop gain and frequency diff Frequency locked loop with constant loop gain and frequency diff

1987-02-20

1988-01-19

Laroche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 11, 331 25, 307526, H03L 706

Patent

active

047206870

ABSTRACT:
A digital signal regenerator comprises a quantizer, a sampler, a timing extractor and a frequency and phase locked loop. The included frequency locked loop employs a frequency difference detector and a frequency generator which it shares with the included phase locked loop. The frequency difference detector includes flip-flops for generating square wave frequency difference signals, obviating the need for the multipliers, comprators and low pass filters used in prior devices. In addition, the frequency difference detector includes pulse-width modulator which is controlled by a pulse-width regulator. The regulator provides for a constant loop gain for the frequency locked loop over different reference frequencies output by the frequency generator.

REFERENCES:
patent: 4015083 (1977-03-01), Bellisio
patent: 4456890 (1984-06-01), Carickhoff

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