Patent ID: 6937091

Claim:
A class D amplifier comprising: a modulating circuit which modulates an input signal to a pulse signal; a first output transistor, a current path of which is connected between a positive power supply and an output terminal; and a second output transistor, a current path of which is connected between a negative power supply and the output terminal; and a drive controlling circuit which complementarily drive the first and second output transistors based on the pulse signal from the modulating circuit, the drive controlling circuit including: a signal generating circuit which generates first complementary signals including positive-phase and negative-phase signals with respect to the pulse signal; a signal converting circuit which converts the first complementary signals to second complementary signals having a voltage component based on the negative power supply; a current driving circuit which, in response to the second complementary signals, outputs third complementary signals having a current component flowing toward the negative power supply; a first driving circuit which, in response to the third complementary signals, drives the first output transistor; and a second driving circuit which, in response to the second complementary signals, drives the second output transistor.