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

Zhang, H.; Berkhout, M.; Makinwa, K.A.A.; Fan, Q.

doi:10.1109/JSSC.2023.3318731

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

Journal article (2023)

Authors

H. Zhang Electronic Instrumentation - , Electronic Components, Technology and Materials -

M. Berkhout Electronic Instrumentation - , Goodix Technologies

K.A.A. Makinwa Microelectronics

Q. Fan Electronic Components, Technology and Materials -

Research Group

Electronic Components, Technology and Materials () (TU Delft)

DOI: https://doi.org/10.1109/JSSC.2023.3318731

Jitter Pulse width modulation Dynamic element matching (DEM) Quantization (signal) Gain Class-D amplifier (CDA) Finite impulse response filters Capacitively coupled chopper amplifier (CCCA) Choppers (circuits) Digital-to-analog converter Intersymbol interference (ISI) Preamplifiers

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Published Date

2023

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Components, Technology and Materials

Abstract

This article presents a digital-input class-D amplifier (CDA) achieving high dynamic range (DR) by employing a chopped capacitive feedback network and a capacitive digital-to-analog converter (DAC). Compared with conventional resistive-feedback CDAs driven by resistive or current-steering DACs, the proposed architecture eliminates the noise from the DAC and feedback resistors. Intermodulation between the chopping, pulsewidth modulation (PWM), and DAC sampling frequency is analyzed to avoid negative impacts on the DR and linearity. Real-time dynamic element matching (RTDEM) is employed to address distortion due to mismatch in the DAC, while its intersymbol interference (ISI) is eliminated by deadbanding. The prototype, implemented in a 180-nm bipolar, CMOS, and DMOS (BCD) process, achieves 120.9 dB of DR and a peak total harmonic distortion plus noise (THD+N) of-111.2 dB. It can drive a maximum of 15/26 W into an 8-/4-Ω load with a peak efficiency of 90%/86%.

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