Oscillators – Frequency stabilization – Temperature or current responsive means in circuit
Patent
1994-01-25
1995-12-05
Pascal, Robert J.
Oscillators
Frequency stabilization
Temperature or current responsive means in circuit
331158, 331116R, 331 66, 331177V, H03B 532, H03L 102
Patent
active
054732891
ABSTRACT:
A temperature compensated crystal oscillator including: an oscillation circuit having a quartz crystal resonator and a control terminal, for providing an oscillating signal determined by the quartz crystal resonator and a control signal, the control signal being applied to the control terminal; a temperature detecting circuit for detecting an operation temperature and outputting a temperature signal based on the operation temperature; and a control signal generating circuit for receiving the temperature signal from the temperature detecting circuit, generating the control signal based on a characteristic curve, and outputting the control signal to the control terminal; the characteristic curve essentially consisting of a plurality of straight lines and being an approximation of an ideal control curve in a predetermined operation temperature range including the operation temperature, the ideal control curve having a relationship between the control signal and the temperature signal for ideally compensating a fluctuation of a frequency of the oscillating signal against changes of the operation temperature, the predetermined operation temperature range being divided into temperature ranges, each of the plurality of straight lines corresponding to one of the divided temperature ranges.
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T. Hara et al., "A Digitally Compensated TCXO Using A Single Chip LSI", IEEE-41st Annual Frequency Control Symposium-1987, pp. 435-438.
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U.S. application Ser. No. 163,590 dated Mar. 3, 1988.
Hashimoto Koji
Ishizaki Toshio
Satoh Yuki
Kinkead Arnold
Matsushita Electric - Industrial Co., Ltd.
Pascal Robert J.
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