Oscillators – Electromechanical resonator – Crystal
Patent
1980-02-29
1982-08-10
Grimm, Siegfried H.
Oscillators
Electromechanical resonator
Crystal
331 37, 331 46, 331175, 331176, H03B 504, H03B 532
Patent
active
043440460
ABSTRACT:
A signal generator includes a high frequency oscillator such as a quartz crystal oscillator at a frequency of 4.19 MHz, a low frequency quartz oscillator with a frequency of 32 kHz, a beat frequency generator for producing a correction signal which is transmitted to a programmable frequency divider, and an electronic switch for periodic switching of the high frequency quartz oscillator. By periodically switching-on the high frequency quartz oscillator, comparing its frequency curve with that of the low frequency quartz oscillator and and appropriately adjusting the programmable frequency divider, the advantages of long term stability, temperature of behavior and aging of a high frequency oscillator are combined with the low current consumption characteristics associated with the low frequency quartz oscillator, whereby the life of a battery powering the signal generator can be substantially extended.
REFERENCES:
patent: 3364439 (1968-01-01), Cohen et al.
patent: 3978650 (1976-09-01), Hashimoto et al.
patent: 4159622 (1979-07-01), Akahane
patent: 4241435 (1980-12-01), Fujita et al.
Effenberger, Jahrbuch der Deutschen Gesellschaftfur Chronometrie E.V. vol. 8, 1977, pp. 9-15, Stuttgart, Germany.
Grimm Siegfried H.
Societe Suisse pour l'Industrie Horlogere Management Services S.
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