Digitally Controlled Temperature Compensated Oscillator System.
Patent, Filed 7 Nov 80, patented 19 Apr 83,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A crystal oscillator that is temperature compensated by digitally substracting 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.
- Electrical and Electronic Equipment