Network for temperature compensation of an AT cut quartz crystal oscillator

摘要

A network for temperature compensation of a crystal oscillator over an extended temperature range encompassing two points of inflection of the drift characteristic of an AT cut crystal. The oscillator is of the type having, in loop connection, an AT cut quartz crystal and a voltage variable capacitance device. The compensation network utilizes a three resistor, three thermistor electrical network for generating a temperature dependent bias voltage applied to the variable capacitance device to compensate for changes in the self-resonant frequency of the crystal due to temperature variation. A method for determining the component values for the compensation network is also disclosed.