Phase-locked loop circuit

Details Phase-locked loop circuit Phase-locked loop circuit

1983-01-28

1985-10-08

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 1A, 331 25, H03L 700

Patent

active

045463301

ABSTRACT:
A phase-locked loop circuit comprises a voltage-controlled oscillator (11), a phase comparator (13), a low-pass filter (15), a plurality of pump circuits (14S, 14F, . . . ), and a selecting circuit (G.sub.45) for selecting one of the pump circuits. The low-pass filter is comprised of a capacitor (C) and a plurality of resistors (R.sub.1 to R.sub.3) each connected to one of the pump circuits. By selecting one of the pump circuits to connect to a corresponding resistor, the cutoff frequency or time constant of the low-pass filter is switched in multi-steps.

REFERENCES:
patent: 4156855 (1979-05-01), Crowley
patent: 4167711 (1979-09-01), Smoot
patent: 4400667 (1983-08-01), Belkin
patent: 4433308 (1984-02-01), Hirata

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