Oscillators – With device responsive to external physical condition – Temperature or light responsive
Patent
1991-07-03
1993-04-06
Mis, David
Oscillators
With device responsive to external physical condition
Temperature or light responsive
331 69, 331158, 331162, 331163, 331176, 310315, 310318, 310342, 310343, 310344, H03B 100, H03B 532, H03L 102, H01L 41107
Patent
active
052007146
ABSTRACT:
A crystal oscillator for generating an output oscillation whose frequency is maintained constant independently of the variation of temperature including a first quartz vibrator arranged in a heating unit which includes a thermostat and vibrating at a fundamental frequency, a second quartz vibrator arranged also in the same heating unit and vibrating at a third overtone frequency, a frequency multiplying circuit for multiplying the fundamental frequency by three, a frequency comparator for comparing the fundamental frequency multiplied by three with the third overtone frequency to derive a frequency difference which represents a temperature of the thermostat, and a temperature controlling circuit for controlling the temperature setting of the thermostat in accordance with the detected frequency difference. Any one or both of the fundamental and third overtone oscillations may be derived as an output oscillation. The first and second quartz vibrators are constructed by a single common quartz substrate, a first pair of electrodes each applied on respective main surfaces of the quartz substrate, and a second pair of electrodes each applied on respective main surfaces of the quartz substrate.
REFERENCES:
patent: 3826931 (1974-07-01), Hammond
patent: 3879992 (1975-04-01), Bartera
patent: 4719384 (1988-01-01), Hauden et al.
patent: 4760351 (1988-07-01), Newell et al.
patent: 4839613 (1989-06-01), Echols et al.
patent: 5004987 (1991-04-01), Hurley
Schodowski, "Resonator Self-Temperature-Sensing Using a Dual-Harmonic-Mode Crystal Oscillator", 43rd Annual Symposium on Frequency Control, pp. 2-7, 1989.
Bloch, et al., "The Microcomputer Compensated Crystal Oscillator", 43rd Annual Symposium on Frequency Control, pp. 16-19, 1989.
Filler, et al., "Resonators for the Microcomputer Compensated Crystal Oscillator", 43rd Annual Symposium on Frequency Control, pp. 8-15, 1989.
Asahi Dempa Co., Ltd.
Mis David
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