To eliminate the influence by variation of a current amplification factor of a transistor to perform high-stability temperature control, in a high-stability oscillator having a thermostatic bath.
In this high-stability oscillator, an oscillation circuit OSC is stored in the thermostatic bath 1. The high-stability oscillator has an arithmetic processing circuit 9 controlling the transistor 2 that is a heating source according to temperature inside the thermostatic bath 1 detected by a thermosensitive element 3. The arithmetic processing circuit 9 finds the current amplification factor of the transistor 2 by a voltage Vc wherein a current Ic flowing through the transistor 2 is detected, calculates an error amplification factor wherein a forward transfer function of a temperature control loop becomes constant on the basis of the current amplification factor, and controls the transistor 2 according to the detection temperature by the thermosensitive element by use of the error amplification factor.
Shoji Kashiwaya
Koichi Watanabe
Toshiro Ito
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