Patent ID: 9059663
Filing Date: 2015-06-16
Classification: H03F

Abstract:
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.