Patent ID: 9509259
Filing Date: 2016-11-29
CPC Classification: H03F

Claim Text:
1. An amplifier comprising: a first transistor which is a common base transistor and whose emitter current fluctuates in accordance with fluctuations in an input current that is input to the emitter; a second transistor which is a common base transistor, whose emitter is connected to the collector of the first transistor, and whose collector voltage fluctuates in accordance with fluctuations in the emitter current of the first transistor; a third transistor which is a common collector transistor and whose base is connected to the collector of the second transistor; and an amplification unit to which an emitter voltage of the third transistor is input and which outputs an amplified voltage obtained by amplifying the emitter voltage of the third transistor, wherein the base resistance of the second transistor is higher than the base resistance of the first transistor.