Patent ID: 9647616
Date: 2017-05-09
CPC Classifications: H03F,H03G

Claim:
1. A power amplifier module, comprising: a first bipolar transistor configured to amplify a radio frequency signal and output an amplified signal; a first terminal to which a control voltage for controlling attenuation of the radio frequency signal is supplied; a second terminal to which a source voltage is applied; a second bipolar transistor, a base of the second bipolar transistor being supplied with the control voltage through the first terminal, and a collector of the second bipolar transistor being supplied with the source voltage through the second terminal; a first resistor and a capacitor that are serially connected and provided between a supply path of the radio frequency signal to the first bipolar transistor; and a third bipolar transistor, a base of the third bipolar transistor being connected to a collector of the third bipolar transistor, and the collector of the third bipolar transistor being connected to an emitter of the second bipolar transistor.