Title
A 121.4-dB DR Capacitively Coupled Chopper Class-D Audio Amplifier
Author
Zhang, H. (TU Delft Electronic Instrumentation) 
Berkhout, Marco (Goodix Technologies)
Makinwa, K.A.A. (TU Delft Microelectronics)
Fan, Q. (TU Delft Microelectronics)
Department
Microelectronics
Date
2022
Abstract
This article presents a class-D amplifier (CDA) with high dynamic range (DR). To eliminate the typically dominant noise contribution of a resistive feedback network, the input and feedback signals are chopped and applied to a capacitive feedback network. However, this leads to high-voltage (HV) transients at the input of the loop filter, which, due to timing and impedance mismatch in the chopped feedback network, could degrade linearity and even overstress low-voltage (LV) core devices. Robust processing of the HV chopped feedback signal is guaranteed with chopper timing skew correction, chopper impedance matching, and deadbanding. The prototype, implemented in a 180-nm bipolar-CMOS-DMOS (BCD) process, achieves 121.4 dB of DR, 5.9 dB higher than state-of-the-art closed-loop CDAs, and 8-μVRMS output-referred noise (A-weighted). It also achieves a peak total harmonic distortion (THD) + N of -109.8 dB and a peak efficiency of 93%/88% while driving 15 W/26 W into an 8-4-Ω load.
Subject
Audio power amplifier
capacitively coupled chopper amplifier
class-D amplifier (CDA)
dynamic range (DR)
noise
To reference this document use:
http://resolver.tudelft.nl/uuid:26983a4f-39ca-4340-9b80-fb3f53b67636
DOI
https://doi.org/10.1109/JSSC.2022.3207907
Embargo date
2023-06-15
ISSN
0018-9200
Source
IEEE Journal of Solid State Circuits, 57 (12), 3736-3745
Bibliographical note
Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
Part of collection
Institutional Repository
Document type
journal article
Rights
© 2022 H. Zhang, Marco Berkhout, K.A.A. Makinwa, Q. Fan