Phase locked loop circuit having temperature compensated VCO con

Details Phase locked loop circuit having temperature compensated VCO con Phase locked loop circuit having temperature compensated VCO con

1986-06-20

1988-01-05

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 8, 331 27, 307516, H03L 718

Patent

active

047178914

ABSTRACT:
A phase locked loop circuit including a controllable oscillator, a phase detector for detecting a phase difference between an output signal of the oscillator and an input signal, and a control signal generator for generating a control signal for controlling an oscillation frequency of the oscillator on the basis of the output of the phase detector. The phase locked loop circuit also includes a feedback circuit for controlling a level of the control signal on the basis of a DC level thereof. The feedback circuit is able to temperature compensate for changes in the oscillator output signal thereby keeping the lock range of the phase locked loop circuit constant against variations in temperature.

REFERENCES:
patent: 3983506 (1976-09-01), Rettinger, Jr. et al.
patent: 4031483 (1977-06-01), Formeister
patent: 4206420 (1980-06-01), Querry et al.
patent: 4454483 (1984-06-01), Baylor
patent: 4506232 (1985-03-01), Thompson

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