POWER AMPLIFIER AND INPUT SIGNAL ADJUSTING METHOD

摘要

A power amplifier includes a class-D amplifier and an input signal supplier. The class-D amplifier includes an input portion and a switching device. The switching device is switched according to an input signal that is input to the input portion so that a current is supplied to a load from a power source via the switching device. The input signal supplier supplies the input signal to the input portion of the class-D amplifier, calculates a virtual output voltage to be output from a virtual power source having a prescribed internal impedance characteristic when a current to flow through the load is output from the virtual power source, and adjust an amplitude of the input signal according to the virtual output voltage.

主权项

1. A power amplifier comprising:
a class-D amplifier that comprises an input portion and a switching device, wherein the switching device is switched in accordance with an input signal that is input to the input portion so that a current is supplied to a load from a power source via the switching device; and an input signal supplier configured to supply the input signal to the input portion of the class-D amplifier, to calculate a virtual output voltage to be output from a virtual power source having a prescribed internal impedance characteristic when a current to flow through the load is output from the virtual power source, and to adjust an amplitude of the input signal in accordance with the virtual output voltage.