Oscillators – Frequency stabilization – Temperature or current responsive means in circuit
Patent
1980-12-19
1983-11-15
Grimm, Siegfried H.
Oscillators
Frequency stabilization
Temperature or current responsive means in circuit
331 17, 331 25, 331 37, 331 46, 331158, H03B 504, H03B 532, H03L 102
Patent
active
044158700
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.
REFERENCES:
patent: 3978650 (1976-09-01), Hashimoto et al.
patent: 4148184 (1979-04-01), Akahane et al.
patent: 4159622 (1979-07-01), Akahane
Akahane, "New Twin Quartz System Revolutionizes Timekeeping Accuracy", JEE, ol. 16, No. 154, (Oct. 1979), pp. 24-27.
Effenberger. "Digitale Temperaturkompensation Von Schwingquartz-Oszillatoren Mit Automatischem Frequenzabgleich", Jahrbuch der Deutschen Gesellschaft fur Chronometric, vol. 28, (1977).
Grimm Siegfried H.
Societe Suisse pour l'Industrie Horlogere Management Services SA
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