| 摘要 |
In an amplifier, a first transistor of npn type has its base connected to an input terminal, a second transistor of pnp type has its base connected to the base of the first transistor, and a third transistor of pnp type has its base connected to the base of the first transistor. A current mirror circuit doubles the collector current of the second transistor so that the doubled current is used as the emitter current of the third transistor. The base currents of the first and second transistors are supplied by the base current of the third transistor.
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