Temperature compensator for a crystal oscillator

Oscillators – Solid state active element oscillator – Transistors

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331176, H03B 536

Patent

active

041076290

ABSTRACT:
Crystal oscillators have been provided with a voltage sensitive capacitor or varactor which can be varied to improve the frequency stability of the oscillator over the desired range of temperature. A temperature compensator is provided for varying the voltage applied to the voltage sensitive capacitor as a function of temperature. The temperature compensator has a middle temperature range circuit, a cold temperature range circuit, and a hot temperature range circuit. The compensator can be constructed as an integrated circuit with external resistors which can be varied (or trimmed), and provides compensating voltages that stabilize the oscillator frequency over a wide range of temperatures.

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patent: 4051466 (1977-09-01), Owaki

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