Digitally controlled temperature compensated oscillator system

Details Digitally controlled temperature compensated oscillator system Digitally controlled temperature compensated oscillator system

1980-11-07

1983-04-19

Grimm, Siegfried H.

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

331 66, H03L 102

Patent

active

043807453

ABSTRACT:
A crystal oscillator that is temperature compensated by digitally substrang a correction frequency from the running frequency of the crystal oscillator to provide the required operating frequency. The correction frequency is generated by a digital frequency synthesizer circuit which is controlled by the output of a programmable read-only memory which has been programmed to generate the required correction frequency for each temperature code over the operating temperature range. The temperature code is generated by gating a digital counter with the output of a monostable multivibrator which utilizes a thermistor to make its gate interval proportional to temperature.

REFERENCES:
patent: 3938316 (1976-02-01), Morokawa et al.
patent: 3978650 (1976-09-01), Hashimoto et al.

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