TEMPERATURE COMPENSATING CIRCUIT FOR OSCILLATOR

摘要

In a temperature compensating circuit for an oscillator, a reference voltage is applied between a pair of opposing nodes in a basic bridge circuit having a temperature sensitive element inserted in an arbitrary branch of the bridge. An input terminal of the oscillator is connected between the other pair of opposing nodes, from which nodes an output voltage of the bridge is supplied to the oscillator. The temperature compensating circuit is featured in that a voltage from another power source is applied to the other pair of opposing nodes through predetermined resistances, and that the values of the bridge components and the predetermined resistance are selected so that the output voltage supplied to the oscillator is kept constant at a specific reference temperature regardless of variations in the another power source voltage, and so that temperature-voltage characteristic of the bridge output voltage varies in correspondence with the temperature-frequency characteristic of the oscillator without changing oscillation frequency at a specific reference temperature.