Crystal oscillator temperature compensating circuit

Details Crystal oscillator temperature compensating circuit Crystal oscillator temperature compensating circuit

1975-04-25

1976-07-20

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331176, H03B 504, H03B 536

Patent

active

039709663

ABSTRACT:
A circuit for generating a temperature varying control voltage which is applied to a varactor diode to temperature compensate a crystal oscillator is disclosed. The circuit produces a substantially linear voltage versus temperature variation, including a point of inflection, in a middle temperature range, and a substantially non-linear voltage versus temperature variation in hot and cold temperature ranges. The control voltage versus temperature characteristic also undergoes a change in slope polarity in both the hot and cold temperature ranges. The temperature compensating circuit has a middle range circuit for independently creating the substantially linear variation in the middle temperature range, a cold range circuit operative below a predetermined temperature for creating the desired variation in the cold temperature range, and a hot temperature circuit operative above a predetermined temperature for creating the desired temperature variation in the hot temperature range. Each temperature range circuit includes a thermistor and a transistor which together control the operative range and the magnitude of the temperature variation contributed by each of the circuits.

REFERENCES:
patent: 3054966 (1962-09-01), Etherington
patent: 3176244 (1965-03-01), Newell et al.
patent: 3508168 (1970-04-01), Chan
patent: 3831111 (1974-08-01), Lafferty

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