Abstract
Based on an error correction method for digital audio class D power amplifiers, a digital audio class D power amplifier is designed at system level in this paper. The power amplifier includes a high-performance low-complexity 8× interpolation filter, a 5-bit 8th-order sigma-delta modulator, a digital double-edge PWM generator and a H-bridge power stage, and can correct the error caused by power supply noise in power stage and nonlinearity of digital PWM generator. At last, the digital audio power amplifier is simulated, the simulation results indicate the maximal SNR of the power amplifier is 103 dB, which is enough to suit the need of high-performance audio power amplifier.
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