| 摘要 |
A bias circuit for an operating transistor has a first resistor disposed in a path for supplying a bias current to a base of the operating transistor, a first transistor for applying the bias current flowing to the first resistor, a second transistor for applying a corresponding current corresponding to the bias current supplied via at least one current mirror circuit, a third transistor having bases connected in common with the first transistor for applying the corresponding current, a second resistor for applying the corresponding current and obtaining a voltage drop corresponding to a voltage drop at the first resistor, and a fourth transistor receiving a reference voltage at an emitter side and having a base connected to an emitter side of the third transistor.
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