Amplifier

Abstract

An amplifier 12 including a first transistor 23 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 24 which is a common base transistor, whose emitter is connected to the collector of the first transistor 23, and whose collector voltage fluctuates in accordance with fluctuations in the emitter current of the first transistor 23, a third transistor 31 which is a common collector transistor and whose base is connected to the collector of the second transistor 24, and an amplification unit 40 to which an emitter voltage of the third transistor 3 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 24 is higher than the base resistance of the first transistor 23.

Dependencies are inferred from the claim text.