Temperature-compensating piezo-oscillator

Oscillators – Solid state active element oscillator – Transistors

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Details

331176, H03B 530

Patent

active

058050280

ABSTRACT:
A temperature-compensating piezo-oscillator uses a piezo-oscillator with temperature coefficient of frequency changing approximately linearly and includes a stabilized source circuit, a temperature-compensating circuit, a voltage control oscillator circuit and a buffer-amplifier circuit. The stabilized source circuit is for stabilizing an inputted voltage and outputs a stabilized voltage. The temperature-compensating circuit is for receiving this stabilized voltage and outputs a temperature-compensated voltage corresponding to the ambient temperature. The voltage control oscillator circuit is for receiving this temperature-compensated voltage and causes the resonance frequency of the piezo-oscillator to change according to this received temperature-compensated voltage, outputting a high-frequency signal. The buffer-amplifier circuit receives and amplifies this high-frequency signal and outputs a high-frequency output voltage. The temperature-compensating circuit includes a thermistor having a negative temperature characteristic, a resistor which is connected in series with one end of this thermistor, another resistor connected in parallel with this series connection, and at least two other resistors each connected to the other end of the thermistor.

REFERENCES:
patent: 4851792 (1989-07-01), Ochiai et al.
patent: 5004988 (1991-04-01), Ueno et al.
patent: 5473289 (1995-12-01), Kshizaki et al.

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