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Title: A 28 nm CMOS 10 bit 100 ms/s asynchronous SAR ADC with low-power switching procedure and timing-protection scheme
Authors: Tang, Fang
Ma, Qiyun
Shu, Zhou
Zheng, Yuanjin
Bermak, Amine
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2021
Source: Tang, F., Ma, Q., Shu, Z., Zheng, Y. & Bermak, A. (2021). A 28 nm CMOS 10 bit 100 ms/s asynchronous SAR ADC with low-power switching procedure and timing-protection scheme. Electronics, 10(22), 2856-.
Journal: Electronics
Abstract: This paper presents a 10 bit 100 MS/s asynchronous successive approximation register (SAR) analog-to-digital converter (ADC) without calibration for industrial control system (ICS) applications. Several techniques are adopted in the proposed switching procedure to achieve better linearity, power and area efficiency. A single-side-fixed technique is utilized to reduce the number of capacitors; a parallel split capacitor array in combination with a partially thermometer coded technique can minimize the switching energy, improve speed, and decrease differential non-linearity (DNL). In addition, a compact timing-protection scheme is proposed to ensure the stability of the asynchronous SAR ADC. The proposed ADC is fabricated in a 28 nm CMOS process with an active area of 0.026 mm2 . At 100 MS/s, the ADC achieves a signal-to-noise-and-distortion ratio (SNDR) of 51.54 dB and a spurious free dynamic range (SFDR) of 55.12 dB with the Nyquist input. The measured DNL and integral non-linearity (INL) without calibration are +0.37/−0.44 and +0.48/−0.63 LSB, respectively. The power consumption is 1.1 mW with a supply voltage of 0.9 V, leading to a figure of merit (FoM) of 35.6 fJ/conversion-step.
ISSN: 2079-9292
DOI: 10.3390/electronics10222856
Schools: School of Electrical and Electronic Engineering 
Research Centres: VIRTUS, IC Design Centre of Excellence 
Rights: © 2021 The Author(s). Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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