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

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

doi:10.1109/JSSC.2023.3318731

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

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

Research output: Contribution to journal › Article › Scientific › peer-review

1 Citation (Scopus)

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%.

Original language	English
Article number	3318731
Pages (from-to)	3470-3480
Number of pages	11
Journal	IEEE Journal of Solid-State Circuits
Volume	58
Issue number	12
DOIs	https://doi.org/10.1109/JSSC.2023.3318731
Publication status	Published - 2023

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.

Keywords

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

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10.1109/JSSC.2023.3318731

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title = "A 120.9-dB DR Digital-Input Capacitively Coupled Chopper Class-D Audio Amplifier",

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%.",

keywords = "Capacitively coupled chopper amplifier (CCCA), Choppers (circuits), class-D amplifier (CDA), digital-to-analog converter, dynamic element matching (DEM), Finite impulse response filters, Gain, intersymbol interference (ISI), Jitter, Preamplifiers, Pulse width modulation, Quantization (signal)",

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

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

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