A Continuous-Time Zoom ADC for Low-Power Audio Applications

Journal article (2020)

Authors

B. Gonen Ethernovia, Electronic Instrumentation - EEMCS
S. Karmakar Electronic Instrumentation - EEMCS
Robert Van Veldhoven NXP Semiconductors
K.A.A. Makinwa Microelectronics
Research Group
Electronic Instrumentation (EEMCS) (TU Delft)
Copyright: © 2020 B. Gonen, S. Karmakar, Robert van Veldhoven, K.A.A. Makinwa
DOI: https://doi.org/10.1109/JSSC.2019.2959480
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Published Date

2020

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

Abstract

This article presents a continuous-Time zoom analog to digital converter (ADC) for audio applications. It employs a high-speed asynchronous SAR ADC that dynamically updates the references of a continuous-Time delta-sigma modulator (CTDSM). Compared to previous switched-capacitor (SC) zoom ADCs, its input impedance is essentially resistive, which relaxes the power dissipation of its reference and input buffers. Fabricated in a 160-nm CMOS process, the ADC occupies 0.27 mm
2 and achieves 108.1-dB peak SNR, 106.4-dB peak signal to noise and distortion ratio (SNDR), and 108.5-dB dynamic range in a 20-kHz bandwidth while consuming 618 \mu \text{W}. This results in a Schreier figure of merit (FoM) of 183.6 dB.

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