A 440-μW, 109.8-dB DR, 106.5-dB SNDR Discrete-Time Zoom ADC With a 20-kHz BW

Journal article (2021)

Authors

E.N. Eland Electronic Instrumentation - EEMCS
S. Karmakar Electronic Instrumentation - EEMCS
B. Gonen Ethernovia
Robert van Veldhoven NXP Semiconductors
K.A.A. Makinwa Microelectronics
Research Group
Electronic Instrumentation (EEMCS) (TU Delft)
Copyright: © 2021 E.N. Eland, S. Karmakar, B. Gonen, Robert van Veldhoven, K.A.A. Makinwa
DOI
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https://doi.org/10.1109/JSSC.2020.3044896
Low-power circuits Delta-sigma ADC A/D conversion Dynamic zoom ADC Inverter-based operational transconductance amplifier (OTA) Audio ADC Asynchronous SAR analog-to-digital converter (ADC) Discrete-time (DT) delta-sigma Multi-bit quantizer
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Published Date

2021

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

Abstract

This article describes a discrete-time zoom analog-to-digital converter (ADC) intended for audio applications. It uses a coarse 5-bit SAR ADC in tandem with a fine third-order delta-sigma modulator (ΔΣM) to efficiently obtain a high dynamic range. To minimize its over-sampling ratio (OSR) and, thus, its digital power consumption, the modulator employs a 2-bit quantizer and a loop filter notch. In addition, an extra feed-forward path minimizes the leakage of the SAR ADC's quantization noise into the audio band. The prototype ADC occupies 0.27 mm2 in a 0.16-μm technology. It achieves 109.8-dB DR, 106.5-dB SNDR, and 107.5-dB SNR in a 20-kHz bandwidth while dissipating 440 μW. It also achieves state-of-the-art energy efficiency, as demonstrated by a Schreier FoM of 186.4 dB and an SNDR FoM of 183.6 dB.