A-121.5 dB THD Class-D Audio Amplifier with 49 dB Suppression of LC Filter Nonlinearity and Robust to +/-30% LC Filter Spread

Conference Paper (2021)
Author(s)

Huajun Zhang (TU Delft - Electronic Instrumentation)

Marco Berkhout (Goodix Technology)

Kofi AA Kofi (TU Delft - Microelectronics)

Qinwen Fan (TU Delft - Electronic Instrumentation)

Research Group
Electronic Instrumentation
Copyright
© 2021 H. Zhang, M. Berkhout, K.A.A. Makinwa, Q. Fan
DOI related publication
https://doi.org/10.23919/VLSICircuits52068.2021.9492441
More Info
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Publication Year
2021
Language
English
Copyright
© 2021 H. Zhang, M. Berkhout, K.A.A. Makinwa, Q. Fan
Research Group
Electronic Instrumentation
ISBN (print)
978-1-6654-4766-9
ISBN (electronic)
978-4-86348-780-2
Reuse Rights

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Abstract

This paper reports a Class-D audio amplifier that uses multiloop feedback to suppress output LC filter nonlinearity by 49 dB, enabling the use of small, low-cost LC filters with ±30% spread while maintaining low distortion. Fabricated in a 180 nm BCD process, the prototype achieves a THD of-121.5 dB and a THD+N of-107.1 dB. It delivers 12W/21W into an 8-Ω/4-Ω load with 91%/87% efficiency.

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