Balancing Efficiency, EMI, and Application Cost in Class-D Audio Amplifiers

Berkhout, Marco

doi:10.1007/978-3-319-97870-3_15

Low-Power Analog Techniques, Sensors for Mobile Devices, and Energy Efficient Amplifiers 2019

DOI: 10.1007/978-3-319-97870-3_15

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Balancing Efficiency, EMI, and Application Cost in Class-D Audio Amplifiers

Marco Berkhout

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Cited by 2 publications

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“…Due to the nonlinearity of practical inductors and capacitors, however, the LC filter may cause significant distortion. According to Berkhout [7], the distortion is dominated by the inductor's current dependence and can be estimated by the following equation:…”

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confidence: 99%

A −121.5-dB THD Class-D Audio Amplifier With 49-dB LC Filter Nonlinearity Suppression

Zhang

Berkhout²,

Makinwa

et al. 2022

IEEE J. Solid-State Circuits

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Class-D audio amplifiers produce electromagnetic interference (EMI), which often needs to be suppressed by an external LC filter. However, due to component nonlinearity, this filter can itself cause significant distortion. This article presents a class-D amplifier that suppresses LC filter nonlinearity by 49 dB and is robust to ±30% variations in its cutoff frequency. This is achieved by a dual-loop architecture, in which an inner loop provides stability, while an outer loop provides the high gain needed to suppress the LC filter and output-stage nonlinearity. A prototype, implemented in a 180-nm BCD process, achieves −121.5-dB total harmonic distortion (THD) and −107.1-dB THD+N, which is maintained to within 3 dB even as the LC filter cutoff frequency is varied from 62 to 106 kHz. It can deliver a maximum of 21 W into a 4-load with 87% efficiency and 12 W into an 8-load with 91% efficiency, measured at 10% THD.

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mentioning

confidence: 99%

A −121.5-dB THD Class-D Audio Amplifier With 49-dB LC Filter Nonlinearity Suppression

Zhang

Berkhout²,

Makinwa

et al. 2022

IEEE J. Solid-State Circuits

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A 120.9-dB DR Digital-Input Capacitively Coupled Chopper Class-D Audio Amplifier

Zhang,

Berkhout,

Makinwa

et al. 2023

IEEE J. Solid-State Circuits

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Balancing Efficiency, EMI, and Application Cost in Class-D Audio Amplifiers

Cited by 2 publications

References 10 publications

A −121.5-dB THD Class-D Audio Amplifier With 49-dB LC Filter Nonlinearity Suppression

A −121.5-dB THD Class-D Audio Amplifier With 49-dB LC Filter Nonlinearity Suppression

A 120.9-dB DR Digital-Input Capacitively Coupled Chopper Class-D Audio Amplifier

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