A -107.8 dB THD+N Low-EMI Multi-Level Class-D Audio Amplifier

Conference paper (2020)

Authors

H. Zhang Electronic Instrumentation - EEMCS
S. Karmakar Electronic Instrumentation - EEMCS
Lucien Breems NXP Semiconductors
Quino Sandifort NXP Semiconductors
M. Berkhout NXP Semiconductors
K.A.A. Makinwa Microelectronics
Q. Fan Electronic Instrumentation - EEMCS
Research Group
Electronic Instrumentation (EEMCS) (TU Delft)
Copyright: © 2020 H. Zhang, S. Karmakar, Lucien Breems, Quino Sandifort, M. Berkhout, K.A.A. Makinwa, Q. Fan
DOI: https://doi.org/10.1109/VLSICircuits18222.2020.9162793
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Published Date

2020

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

Abstract

This paper describes a class-D audio amplifier with a multilevel output stage that reduces both EMI and idle power. High loop gain, and thus high linearity, are enabled by a relatively high (4.2 MHz) switching frequency, which relaxes the requirements on its output LC filter. Fabricated in a 180nm BCD technology, it can drive 14 W into an 8-Ω load with state-of-the-art performance: -107.8 dB THD+N, 91% peak efficiency, and 7 mA quiescent current. It meets the CISPR 25 Class 5 radiated emission standard with a low-cost 580 kHz LC filter, improving the state-of-the-art by 5.8x.

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