A 28-W, -102.2-dB THD+N Class-D Amplifier Using a Hybrid ΔΣM-PWM Scheme

Journal article (2020)

Authors

S. Karmakar Electronic Instrumentation - EEMCS
H. Zhang Electronic Instrumentation - EEMCS
Robert van Veldhoven NXP Semiconductors
L Breems NXP Semiconductors
M. Berkhout Goodix Technologies
Q. Fan Electronic Instrumentation - EEMCS
K.A.A. Makinwa Microelectronics
Research Group
Electronic Instrumentation (EEMCS) (TU Delft)
Copyright: © 2020 S. Karmakar, H. Zhang, Robert van Veldhoven, Lucien J. Breems, M. Berkhout, Q. Fan, K.A.A. Makinwa
DOI
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https://doi.org/10.1109/JSSC.2020.3023874
Hybrid Class-D amplifier Audio power amplifier Electro-magnetic interference (EMI) Pulsewidth modulation (PWM) ΔΣM
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Published Date

2020

Language

English

Reuse Rights

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

Abstract

This article presents a 28-W class-D amplifier for automotive applications. The combination of a high switching frequency and a hybrid multibit Δ Σ M-PWM scheme results in high linearity over a wide range of output power, as well as low AM-band EMI. As a result, only a small (150-kHz cutoff frequency), and thus low-cost, LC filter is needed to meet the CISPR-25 EMI average limit (150 kHz-30 MHz) with 10-dB margin. At 28-W output power, the proposed amplifier achieves 91% efficiency while driving a 4- Ω load from a 14.4-V supply. It attains a peak THD+N of 0.00077% (-102.2 dB) for a 1-kHz input signal.