Oscillator circuit with digital temperature compensation
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United States of America Patent
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Nov 15, 1983
Grant Date -
N/A
app pub date -
Dec 19, 1980
filing date -
Jan 10, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An oscillator circuit having a digital temperature compensation circuit which contains two low frequency quartz oscillators, a beat frequency generator and a correction circuit and a logic circuit selectively controlling an addition circuit. The beat frequency generator receives the frequencies generated by the low frequency oscillators. The difference between the low frequencies is fed into the correction circuit which in turn cooperates with the logic circuit. The beat frequency generator is controlled by a high frequency oscillator having an integrated RC circuit and the correction circuit has a PROM in which the correction functions are stored. The selectively controlled addition circuit acts on the output signal of the first oscillator and corrects the frequency thereof. An oscillator circuit connected in such a manner requires no pre-selection of the quartz crystals in pairs and the correction may be effected by influencing the high frequency oscillator, whereby a high degree of accuracy may be obtained.
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