Patent ID: 7242250

Claim:
A power amplifier circuit comprising: an input circuit which receives an input signal and a feedback signal, amplifies the input signal and the feedback signal, and outputs a first control signal and a second control signal; a first power supply line supplied with a first power supply voltage; a second power supply line supplied with a second power supply voltage, the second power supply voltage being lower than the first power supply voltage; a third power supply line supplied with a third power supply voltage, the third power supply voltage being lower than the second power supply voltage; a push-side driving circuit which is connected to the first power supply line, receives the first control signal, and has three first driving signal output terminals; a pull-side driving circuit which is connected to the third power supply line, receives the second control signal, and has three second driving signal output terminals; a first driving signal line, a second driving signal line and a third driving signal line connected between the three first driving signal output terminals and the three second driving signal output terminals, respectively; a first MOS transistor having a current path connected at one end to the first power supply line, and having a gate connected to the first driving signal line; a second MOS transistor having a current path connected at one end to the second power supply line, and having a gate connected to the second driving signal line; a third MOS transistor having a current path connected at one end to the third power supply line, and having a gate connected to the third driving signal line; an output terminal commonly connected to the other end of the current path of each of the first MOS transistor, the second MOS transistor and the third MOS transistor; an impedance circuit which includes a fourth MOS transistor, which has a current path connected between the first power supply line and the gate of the first MOS transistor or between the third power supply line and the gate of the third MOS transistor, has a gate connected to the gate of the first MOS transistor or the third MOS transistor, and adjusts a gate impedance of the first MOS transistor or the third MOS transistor; and a feedback circuit which is connected between the output terminal and the input circuit and sends the feedback signal to the input circuit.