Variable frequency oscillator system including two matched oscil

Details Variable frequency oscillator system including two matched oscil Variable frequency oscillator system including two matched oscil

1977-12-30

1978-12-26

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

325184, 329 50, 329122, 331 8, 331 10, 331 25, 331108D, 331113R, 332 14, 332 16T, 332 19, H03B 304, H03C 300, H03D 318

Patent

active

041318617

ABSTRACT:
Disclosed is a variable frequency oscillator system having a very stable center frequency and adjustable over a wide range of frequency excursions. A pair of variable frequency oscillators (VFO) are fabricated on the same integrated circuit chip so that corresponding components have substantially identical characteristics. The first VFO and a highly stable crystal oscillator provide comparable frequency output signals to a phase locked loop which provides as its output a correction signal (voltage or current) to lock the first VFO to the crystal oscillator frequency. The frequency of the second VFO in turn will be essentially the same as that of the first because of similarities in components and operating conditions as well as sharing of the correction signal between the two VFO's. The output of the second VFO provides the local clock signal and can be varied further by a second correction signal. In one embodiment, the second correction signal is provided by a second phase locked loop.

REFERENCES:
patent: 3371281 (1968-02-01), Powell
patent: 3899746 (1975-08-01), Gammel

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