| 摘要 |
An amplifier circuit comprises a differential amplifier configured by a differential pair of transistors, a common emitter amplifier connected in parallel to the differential amplifier and configured by a pair of common-emitter configuration transistors, input and output terminals which are common to the differential amplifier and the common emitter amplifier, and a bias controller connected to the differential amplifier and the common emitter amplifier and configured to control a bias of at least one of the differential amplifier and the common emitter amplifier.
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