AC loop gain and DC prepositioning adjustment for phase locked l

Details AC loop gain and DC prepositioning adjustment for phase locked l AC loop gain and DC prepositioning adjustment for phase locked l

1984-10-19

1986-06-17

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 17, 331 25, H03L 708

Patent

active

045958866

ABSTRACT:
There is disclosed a circuit and technique for adjusting the AC loop gain and DC prepositioning in a phase locked loop. The system includes an in-phase and out-of-phase signal applied through exclusive-OR gate circuitry which includes inputs from a PROM to digitally adjust the AC gain in the phase locked loop. The PROM also stores digital values representing a desired DC prepositioning level which is coupled to the loop and converted to provide a signal summed with the AC signal to adjust the prepositioning level.

REFERENCES:
patent: 3582810 (1971-06-01), Gillette
patent: 4117419 (1978-09-01), Rudd
patent: 4118674 (1978-10-01), Ball
patent: 4400667 (1983-08-01), Belkin
patent: 4404530 (1983-09-01), Stryer
patent: 4494080 (1985-01-01), Call
patent: 4511858 (1985-04-01), Charavit et al.

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