¹VLSI Institute, Tongji University, ShangHai, China
²School of Electronics and Information, Northwestern Polytechnical University, Xi’an, China

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Abstract—In a digital class D power amplifier, the distortion is introduced into the input signal being amplified in power stage, due to the effect of power supply noise. A method used to eliminate the distortion is presented in the paper. This method is adding correction factors to all integrators of Delta-Sigma modulator, and introducing power supply noise to the input of the class D power amplifier and Delta-Sigma modulator. A design example with the method is presented, and the simulation results indicate this method can eliminate the error introduced by power stage.

Index Terms—power stage, power supply noise, Delta-Sigma modulator, digital class D power amplifier, PWM.

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Cite: Hui Feng, Zeqi Yu, "The Correction Method for Power Noise in Digital Class D Power Amplifiers," Journal of Software vol. 8, no. 2, pp. 488-495, 2013.