Temperature compensated crystal oscillator

Details Temperature compensated crystal oscillator Temperature compensated crystal oscillator

1979-10-15

1981-10-27

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331176, H03B 504, H03B 536

Patent

active

042976553

ABSTRACT:
A temperature compensated crystal oscillator having a crystal resonator uses a single thermistor and no expensive varactor. The compensation circuit includes, a low temperature compensation circuit consisting of a first fixed capacitor and a first diode in series, a high temperature compensation circuit consisting of a second fixed capacitor and a second diode in series, and an intermediate temperature compensating circuit consisting of a third capacitor having a negative temperature coefficient. All three circuits are in parallel with each other and in series with the crystal resonator of the oscillator. A thermistor is connected to the anodes of both diodes and biasing resistors and connected to the cathode of the second diode whereby a temperature dependent forward bias is applied to the first diode at all temperatures and to the second diode only at the high temperatures.

REFERENCES:
patent: 3322981 (1967-05-01), Brenig
patent: 3525055 (1970-08-01), Mrozek

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