| 摘要 |
PURPOSE:To perform stabilization eliminating an influence by a high frequency signal, by interposing the second and the fourth transistors, etc., connected specifically to the voltage of a bias circuit supplied to a constant current source circuit. CONSTITUTION:A bias circuit 1 is constituted of the first - the fourth transistors (TR) Q1-Q4 which connect etc., the collector terminal of the first PNP type transistor TRQ1 to the first constant current source I0, the first - the second constant current sources I0 and I1, and the first - the second resistors R1-R2, and a bias voltage is outputted from the emitter terminal of the TRQ4. Also, a constant current source circuit 2 is constituted by connecting the previous stated bias voltage to the base terminal of a TRQ5, and a constant current is outputted. In this way, a voltage component between the base and the emitter of the TRQ4, the voltage between the base and the emitter of the TRQ2, and the voltage between the bases and the emitters of the TRQ1 and the TRQ5 respectively, are negated with each other, and the collector current of the TRQ5 is compensated so as not to be affected by a temperature change.
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