Crystal oscillator temperature compensating circuit

Details Crystal oscillator temperature compensating circuit Crystal oscillator temperature compensating circuit

H - Electricity

03

B

331/60

H03B 5/04 (2006.01) H03L 1/02 (2006.01)

Patent

CA 1139380

-1- 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 oscil- lator. 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 predeter- mined 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 circui- try 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.

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