Oscillator circuit with digital temperature compensation

Details Oscillator circuit with digital temperature compensation Oscillator circuit with digital temperature compensation

1980-12-30

1984-01-24

Grimm, Siegfried H.

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

331 37, 331 46, H03L 102

Patent

active

044279523

ABSTRACT:
The oscillator circuit comprises a digital temperature compensation circuit connected to a low and a high frequency quartz oscillator. The two quartz oscillators have the same inversion temperature points and a different temperature behaviour.
In the temperature compensation circuit a beat frequency is produced between the divided signal of the high frequency oscillator and the frequency of the low frequency oscillator and then fed to a correction circuit and multiplied therein with a correction factor which has been stored in a PROM. The obtained correction signal is fed into the frequency divider chain for obtaining a temperature compensated outgoing signal for use in a timer circuit.
The temperature compensation circuit is simply designed and allows high accuracy, which is particularly well suited for a wristwatch or a photo camera.

REFERENCES:
patent: 4071797 (1978-01-01), Zumsteg et al.
patent: 4159622 (1979-07-01), Akahane
patent: 4344046 (1982-08-01), Zumsteg
patent: 4345221 (1982-03-01), Zumsteg
Effenburger, "Digitale Temperaturkompensation von Schwingquarzoszillatoren it Automatischem Frequenzabgleich," Jahrbuch der Deutschen fur Chronometrie, vol. 28, 1977 (Stuttgart, Germany); pp. 9-15.
Electronics Letters, Jul. 10, 1975, vol. II, No. 14; pp. 304-305.

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