Phase-locked loop stabilized by a crystal oscillator

Details Phase-locked loop stabilized by a crystal oscillator Phase-locked loop stabilized by a crystal oscillator

1979-12-13

1982-01-12

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 17, 331 25, 331DIG2, H03L 710, H03L 714, H03L 718

Patent

active

043108059

ABSTRACT:
A phase-locked loop circuit, having an oscillator controlled by a voltage related to the phase difference between a reference signal and a loop signal, is stabilized by a crystal oscillator. The voltage controlled oscillator signal is frequency-subtracted from the crystal oscillator signal frequency to provide an input signal to a frequency-arithmetic synthesizer which provides a loop signal to the phase detector for comparison with the coming reference signal. Use of a frequency-adder circuit between the voltage controlled oscillator and the frequency-subtractor, and receiving an addition frequency derived from the frequency-arithmetic synthesizing circuit, is utilized to decrease the loop gain and provide enhanced characteristics.

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patent: 3944723 (1976-03-01), Fong
patent: 3973087 (1976-08-01), Fong
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patent: 4061973 (1977-12-01), Reimers et al.
patent: 4101834 (1978-07-01), Stutt et al.
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patent: 4135181 (1979-01-01), Bogacki et al.
patent: 4161720 (1979-07-01), Bogacki
patent: 4205277 (1980-05-01), Poinas

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