Oscillators – Frequency stabilization – Temperature or current responsive means in circuit
Patent
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.
Grimm Siegfried H.
Societe Suisse pour l'Industrie Horlogere Management Services SA
Westin Edward P.
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