Audio output circuit, electronic device using the same, and audio integrated circuit

摘要

An audio output circuit for driving an electro-acoustic transducer includes first and second D-class amplifiers, a pulse modulator to receive an audio signal and generate first and second pulse signals for driving first and second D-class amplifiers, first and second drivers to drive first and second D-class amplifiers in response to first and second pulse signals, respectively, a common mode choke coil, and a delay setting circuit to apply a relative delay to output signals of the first and second D-class amplifiers.

主权项

1. An audio output circuit for driving an electro-acoustic transducer, comprising:
a first D-class amplifier; a second D-class amplifier; a pulse modulator configured to receive an audio signal to generate a first pulse signal and a second pulse signal for driving the first D-class amplifier and the second D-class amplifier, respectively; a first driver configured to drive the first D-class amplifier in response to the first pulse signal; a second driver configured to drive the second D-class amplifier in response to the second pulse signal; a common mode choke coil including a first coil, a second coil, and a core around which the first coil and the second coil are wound, one end of the first coil being connected to an output terminal of the first D-class amplifier and the other end of the first coil being connected to a positive terminal of the electro-acoustic transducer, and one end of the second coil being connected to an output terminal of the second D-class amplifier and the other end of the second coil being connected to a negative terminal of the electro-acoustic transducer; and a delay setting circuit configured to apply a relative delay to an output signal of the first D-class amplifier and an output signal of the second D-class amplifier.