Crystal oscillator temperature compensating circuit

Details Crystal oscillator temperature compensating circuit Crystal oscillator temperature compensating circuit

1979-03-19

1981-03-03

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331176, H03B 536, H03B 504

Patent

active

042543827

ABSTRACT:
An integratable circuit is utilized for generating a temperature varying control voltage to be applied to a varactor diode to temperature compensate a crystal oscillator. The temperature compensating circuit has a middle range circuit for creating a substantially linear current versus temperature variation in a middle temperature range, a cold-temperature range circuit operative below a predetermined temperature for creating a non-linear current versus temperature variation a hot-temperature range circuit operative above a predetermined temperature for creating a non-linear current versus temperature variation and circuitry for summing said currents and generating a voltage proportional to the current sum. The control circuit, which requires a regulated supply voltage, uses a diode string and differential amplifiers to generate the desired current versus temperature variation.

REFERENCES:
patent: 3831111 (1974-08-01), Lafferty
patent: 3970966 (1976-07-01), Keller et al.
patent: 4096452 (1978-06-01), Waku et al.
patent: 4107629 (1978-08-01), Stone, Jr.

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