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Real-Time Power Supply Feedback Reduces Power Conversion Requirements For Digital Class D Amplifiers

The development of real-time power supply feedback for an all-digital Class D PWM amplifier enables the use of many different power conversion techniques allowing a greater number of alternatives to meet system demand requirements. With a typical voltage ripple rejection of 40dB at 60Hz, an all-digital PWM amplifier with this PSR compensation can achieve better than 105dB system dynamic range and a total harmonic distortion plus noise measurement of 0.1%. The system performance of the real-time PSR feedback is discussed and evaluated for a half-bridge and full-bridge amplifier output stage powered from a low cost unregulated linear power supply.

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