A 121.4dB DR, -109.8dB THD+N Capacitively-Coupled Chopper Class-D Audio Amplifier

Huajun Zhang; Marco Berkhout; Kofi A.A. Makinwa; Qinwen Fan

doi:10.1109/ISSCC42614.2022.9731737

A 121.4dB DR, -109.8dB THD+N Capacitively-Coupled Chopper Class-D Audio Amplifier

Huajun Zhang, Marco Berkhout, Kofi A.A. Makinwa, Qinwen Fan

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

2 Citations (Scopus)

67 Downloads (Pure)

Abstract

Class-D amplifiers (CDAs) are often used in audio applications due to their superior power efficiency. Due to the sensitivity of the human ear, a large dynamic range (DR) is desired, and audio DACs with up to 130dB DR are commercially available [1]. However, the DR of the CDAs they drive is typically much lower [2]-[4], mainly due to the thermal noise introduced by the input resistors of their resistive feedback networks. Reducing this resistance is difficult, as it reduces the CDA's input impedance and increases the required loop-filter capacitance. Alternatively, the CDA could be configured as a capacitively coupled chopper amplifier (CCCA), whose capacitive feedback network could then achieve low noise without reducing input impedance. However, the large PWM component present at its output would then saturate its input stage. By exploiting the inherent PWM filtering present in a feedback-after-LC architecture, this paper presents a capacitively coupled chopper CDA, resulting in significantly improved DR and THD+N. The prototype achieves 8V_RMS of integrated output noise (A-weighted), a 121.4dB DR, and -1 09.8dB THD+N while delivering a maximum of 15/26W into an 8/4Omega load with 93%/88% efficiency.

Original language	English
Title of host publication	2022 IEEE International Solid- State Circuits Conference (ISSCC)
Subtitle of host publication	Digest of technical papers
Editors	Laura C. Fujino
Place of Publication	Danvers
Publisher	IEEE
Pages	484-486
Number of pages	3
ISBN (Electronic)	978-1-6654-2800-2
ISBN (Print)	978-1-6654-2801-9
DOIs	https://doi.org/10.1109/ISSCC42614.2022.9731737
Publication status	Published - 2022
Event	2022 IEEE International Solid- State Circuits Conference (ISSCC) - Online at San Francisco, United States Duration: 20 Feb 2022 → 26 Feb 2022

Publication series

Name	Digest of Technical Papers - IEEE International Solid-State Circuits Conference
Volume	2022-February
ISSN (Print)	0193-6530

Conference

Conference	2022 IEEE International Solid- State Circuits Conference (ISSCC)
Abbreviated title	ISSCC 2022
Country/Territory	United States
City	Online at San Francisco
Period	20/02/22 → 26/02/22

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.

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Cite this

Zhang, H., Berkhout, M., Makinwa, K. A. A., & Fan, Q. (2022). A 121.4dB DR, -109.8dB THD+N Capacitively-Coupled Chopper Class-D Audio Amplifier. In L. C. Fujino (Ed.), 2022 IEEE International Solid- State Circuits Conference (ISSCC): Digest of technical papers (pp. 484-486). Article 9731737 (Digest of Technical Papers - IEEE International Solid-State Circuits Conference; Vol. 2022-February). IEEE. https://doi.org/10.1109/ISSCC42614.2022.9731737

Zhang, Huajun ; Berkhout, Marco ; Makinwa, Kofi A.A. et al. / A 121.4dB DR, -109.8dB THD+N Capacitively-Coupled Chopper Class-D Audio Amplifier. 2022 IEEE International Solid- State Circuits Conference (ISSCC): Digest of technical papers. editor / Laura C. Fujino. Danvers : IEEE, 2022. pp. 484-486 (Digest of Technical Papers - IEEE International Solid-State Circuits Conference).

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title = "A 121.4dB DR, -109.8dB THD+N Capacitively-Coupled Chopper Class-D Audio Amplifier",

abstract = "Class-D amplifiers (CDAs) are often used in audio applications due to their superior power efficiency. Due to the sensitivity of the human ear, a large dynamic range (DR) is desired, and audio DACs with up to 130dB DR are commercially available [1]. However, the DR of the CDAs they drive is typically much lower [2]-[4], mainly due to the thermal noise introduced by the input resistors of their resistive feedback networks. Reducing this resistance is difficult, as it reduces the CDA's input impedance and increases the required loop-filter capacitance. Alternatively, the CDA could be configured as a capacitively coupled chopper amplifier (CCCA), whose capacitive feedback network could then achieve low noise without reducing input impedance. However, the large PWM component present at its output would then saturate its input stage. By exploiting the inherent PWM filtering present in a feedback-after-LC architecture, this paper presents a capacitively coupled chopper CDA, resulting in significantly improved DR and THD+N. The prototype achieves 8V_RMS of integrated output noise (A-weighted), a 121.4dB DR, and -1 09.8dB THD+N while delivering a maximum of 15/26W into an 8/4Omega load with 93%/88% efficiency.",

author = "Huajun Zhang and Marco Berkhout and Makinwa, {Kofi A.A.} and Qinwen Fan",

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. ; 2022 IEEE International Solid- State Circuits Conference (ISSCC), ISSCC 2022 ; Conference date: 20-02-2022 Through 26-02-2022",

year = "2022",

doi = "10.1109/ISSCC42614.2022.9731737",

language = "English",

isbn = "978-1-6654-2801-9",

series = "Digest of Technical Papers - IEEE International Solid-State Circuits Conference",

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Zhang, H, Berkhout, M, Makinwa, KAA & Fan, Q 2022, A 121.4dB DR, -109.8dB THD+N Capacitively-Coupled Chopper Class-D Audio Amplifier. in LC Fujino (ed.), 2022 IEEE International Solid- State Circuits Conference (ISSCC): Digest of technical papers., 9731737, Digest of Technical Papers - IEEE International Solid-State Circuits Conference, vol. 2022-February, IEEE, Danvers, pp. 484-486, 2022 IEEE International Solid- State Circuits Conference (ISSCC), Online at San Francisco, United States, 20/02/22. https://doi.org/10.1109/ISSCC42614.2022.9731737

A 121.4dB DR, -109.8dB THD+N Capacitively-Coupled Chopper Class-D Audio Amplifier. / Zhang, Huajun; Berkhout, Marco; Makinwa, Kofi A.A. et al.
2022 IEEE International Solid- State Circuits Conference (ISSCC): Digest of technical papers. ed. / Laura C. Fujino. Danvers: IEEE, 2022. p. 484-486 9731737 (Digest of Technical Papers - IEEE International Solid-State Circuits Conference; Vol. 2022-February).

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

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AU - Fan, Qinwen

N1 - 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.

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Zhang H, Berkhout M, Makinwa KAA , Fan Q. A 121.4dB DR, -109.8dB THD+N Capacitively-Coupled Chopper Class-D Audio Amplifier. In Fujino LC, editor, 2022 IEEE International Solid- State Circuits Conference (ISSCC): Digest of technical papers. Danvers: IEEE. 2022. p. 484-486. 9731737. (Digest of Technical Papers - IEEE International Solid-State Circuits Conference). doi: 10.1109/ISSCC42614.2022.9731737

A 121.4dB DR, -109.8dB THD+N Capacitively-Coupled Chopper Class-D Audio Amplifier

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