Phase locked loop with self-adjusting circuit for oscillator wor

Details Phase locked loop with self-adjusting circuit for oscillator wor Phase locked loop with self-adjusting circuit for oscillator wor

1988-09-22

1990-04-17

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 14, 331 16, 331 17, H03L 710

Patent

active

049184040

ABSTRACT:
A self-adjusting phase lock circuit including a frequency and/or phase comparator which compares the frequency and/or phase of a reference signal FVCO with the frequency and/or phase of a frequency or phase modulated signal RD generates an error signal which is applied as an input to an integrating network. The network generates an error voltage VC related to the frequency/phase error of the two signals which is applied to the control input of a voltage controlled oscillator operative to generate the reference signal FVCO as a function of the error voltage and of an adjusting voltage received at an adjusting input of the oscillator. Self-adjusting means is provided which includes a fixed reference voltage periodically applied as an input to the control input of the oscillator as a substitute for the error voltage and a source of a fixed frequency signal periodically applied as an input to the comparator as a substitute for the modulated signal RD. An operational network generates from the error voltage VC, a feedback signal (VRANGE) which is periodically applied to the adjusting input of the oscillator and held at said input by sample and hold circuits so that the adjusting voltage VRANGE is periodically adjusted automatically to maintain the phase lock circuit in an operative condition permanently close to a nominal working point independently of thermal drift and the performance spread of the components used.

REFERENCES:
patent: 4365211 (1982-12-01), Lee
patent: 4814725 (1989-03-01), Vitiello
European Patent Application No. 0 274 591, published 20.07.88 Bulletin 88/29.

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