To provide a power amplifier with high accuracy, a high-speed response and a low loss.
In the power amplifier comprising a main circuit power supply section provided with a positive power supply and a negative power supply and a power amplifier section AMP to which power of the main circuit power supply section is supplied, the main circuit power supply section comprises a plurality of main circuit power supplies Vs1, Vs2 to Vsn whose power supply voltage differs from each other, a control circuit section Cc applying drive-control to power transistors of main circuit sections Pv, Nv for switching of the power supply voltage on the basis of a command of the power amplifier circuit or an input voltage u, and the command or the input voltage u of the power amplifier circuit selects any of power supply voltages whose absolute value is greater when the absolute value of the input and its amount of change is great.
SATO SHINOBU
MATSUMOTO TOSHIO
OKAMOTO KAZUHIRO
Hironori Honda
Toshimitsu Ichikawa
Takeshi Takamatsu
Yuriko Kuriu