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All-Digital Power Amplifier Based on Pulse-Width Modulation

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An all-digital power amplifier capable of driving a loudspeaker at high-power levels is analyzed and implemented. The amplifier is based on linearized pulse-width modulation (LPWM). The LPWM amplifier has an efficiency of >90% at eight-times oversampling. It is shown that the distortion generated by the output stage limits the system performance. The LPWM amplifier is compared with a Sigma-Delta modulator based amplifier.

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Permalink: http://www.aes.org/e-lib/browse.cfm?elib=6423

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