Wideband amplifying circuit having large degree of freedom in bias setting

Abstract

A wideband amplifying circuit includes a first bipolar transistor in which an RF signal is input at an input terminal, a transistor output circuit connected to a collector of the first bipolar transistor, and a feedback circuit connected between the output terminal of the transistor output circuit and a base of the first bipolar transistor. The feedback circuit is formed by a series-connected circuit of a first resistor in which one terminal is connected to the input terminal of the first bipolar transistor, and a second resistor in which one terminal is connected to the output terminal of the transistor output circuit and the other terminal is connected to the other terminal of the first resistor, and a third resistor is provided between a connection point of the first resistor and the second resistor and the ground.

Dependencies are inferred from the claim text.