Temperature-compensated crystal oscillator circuit

Details Temperature-compensated crystal oscillator circuit Temperature-compensated crystal oscillator circuit

1985-11-20

1986-08-19

LaRoche, Eugene R.

Oscillators

Solid state active element oscillator

Transistors

331158, 331176, 331177V, H03B 536, H03L 104

Patent

active

046072373

ABSTRACT:
A crystal oscillator circuit that is temperature compensated over a broad temperature range has a crystal oscillator, a reactance compensation circuit for providing temperature compensation at low temperatures, and a control voltage-generating circuit for providing temperature compensation at high temperatures. The reactance compensation circuit includes the parallel combination of a thermistor and a variable-capacitance diode, and this parallel combination is connected in series with the crystal oscillator. The control voltage-generating circuit includes a thermistor and transistors and applies a voltage corresponding to the ambient temperature to the variable-capacitance diode of the reactance compensation circuit.

REFERENCES:
patent: 3527693 (1976-02-01), Waku
patent: 3641461 (1972-02-01), Mrozek
patent: 4063194 (1977-12-01), Helle

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