Phase-locked loop including an amplifier circuit arrangement

Details Phase-locked loop including an amplifier circuit arrangement Phase-locked loop including an amplifier circuit arrangement

1981-06-22

1984-06-12

Mullins, James B.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

328143, 328165, 330126, 330149, 455260, H03L 700, H03F 368

Patent

active

044544847

ABSTRACT:
An amplifier circuit arrangement comprises an inverting (2) and a non-inverting amplifier (4) connected between a common input (1) and respective inputs of a summing circuit (6). The gains of the amplifiers are unequal for low amplitude input signals but are arranged to produce substantially equal antiphase limited outputs for high amplitude input signals. By making the gains of the amplifiers greater than the difference between their gains, a rapid transition is obtained from a situation where the gain of the arrangement corresponds to the numerical difference between the amplifier gains, to one where it has fallen to a low level. This property can be used in a phase-locked loop of which four examples are given, when the beat frequency output of a phase sensitive detector connected to the input of the amplifier arrangement is large, the output of the summing circuit (6) will be low. Conversely, when the phase sensitive detector falls to a low level indicating that a frequency lock is obtained, the output of the summing circuit will be high.

REFERENCES:
patent: 1705993 (1929-03-01), Oswald
patent: 4135159 (1979-01-01), Kubanoff

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