Temperature compensation circuit for crystal oscillator

Details Temperature compensation circuit for crystal oscillator Temperature compensation circuit for crystal oscillator

1975-09-02

1977-04-26

Grimm, Siegfried H.

Oscillators

Electromechanical resonator

Crystal

331176, H03B 504, H03B 532

Patent

active

040204260

ABSTRACT:
A crystal-controlled oscillator whose frequency is regulated as a function of temperature and having a feedback loop with a capacitor whose capacitance is electrically variable, to which capacitor a variable electrical compensating signal varying in accordance with a third-degree law as a function of temperature, is applied. The compensating circuit in accordance with the invention produces a signal of this kind at its terminals by three units respectively comprising three thermistors R.sub.T1, R.sub.T2, R.sub.T3, each unit being specifically designed to create the signal corresponding to a given arcuate portion of the total graph function. The applications are in particular in the field of portable radio transmitters.

REFERENCES:
patent: 3054966 (1962-09-01), Etherington
patent: 3200349 (1965-08-01), Bangert
patent: 3581236 (1971-05-01), Berman

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