A 590 μw, 106.6 dB SNDR, 24 kHz BW Continuous-Time Zoom ADC with a Noise-Shaping 4-bit SAR ADC

Conference paper (2022)

Authors

Shubham Mehrotra NXP Semiconductors, Student
Efraim Eland Student
S. Karmakar Electronic Instrumentation - EEMCS
Angqi Liu Student
B. Gonen Ethernovia, Electronic Instrumentation - EEMCS
M. Bolatkale Electronic Instrumentation - EEMCS , NXP Semiconductors
Robert Van Veldhoven NXP Semiconductors
Kofi A.A. Makinwa Microelectronics
K.A.A. Makinwa Microelectronics
Research Group
Electronic Instrumentation (EEMCS) (TU Delft)
Copyright: © 2022 Shubham Mehrotra, Efraim Eland, S. Karmakar, Angqi Liu, B. Gonen, M. Bolatkale, Robert Van Veldhoven, K.A.A. Makinwa
DOI: https://doi.org/10.1109/ESSCIRC55480.2022.9911295
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Published Date

2022

Language

English

Reuse Rights

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Instrumentation

Abstract

This paper presents a continuous-Time zoom ADC for audio applications. It combines a 4-bit noise-shaping coarse SAR ADC and a fine delta-sigma modulator with a tail-resistor linearized OTA for improved linearity, energy efficiency, and handling of out-of-band interferers compared to previous designs. In 160 nm CMOS, the prototype chip occupies 0.36 mm2, achieves 107.2 dB SNR, 106.6 dB SNDR, and 107.3 dB dynamic range in a 24 kHz bandwidth while consuming 590 μW from a 1.8 V supply. This translates into a Schreier figure-of-merit (FoMs) of 183.4 dB and a FoMSNDR of 182.7 dB.

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