A 9.87 nW 1 kS/s 8.7 ENOB SAR ADC for implantable epileptic seizure detection microsystems
Author
Do, Anh Tuan
Lam, Chun Kit
Tan, Yung Sern
Yeo, Kiat Seng
Cheong, Jia Hao
Yao, Lei
Tan, Meng Tong
Je, Minkyu
Date of Issue
2012Conference Name
IEEE Asia Pacific Conference on Circuits and Systems (2012 : Kaohsiung, Taiwan)
School
School of Electrical and Electronic Engineering
Abstract
This paper presents an ultra low-power SAR ADC in 0.18 μm CMOS technology for epileptic seizure detection applications. The ADC is powered by a single supply voltage of both analog and digital circuits to avoid using the level-shifters. A latched comparator is used to quickly generate the comparison results while consuming no DC current. Split-cap architecture with an attenuation cap is used to minimize area and to further reduce the power consumption. A smaller-than-unit capacitor is used at the end of the least significant bit array to mitigate the negative impact of the parasitic components on the linearity of the capacitors array. As a result, both DNL/INL and SNDR of the ADC is improved. Our post-layout simulation shows that at 1 V supply, 1 kS/s the proposed SAR archives 8.7 ENOB while consuming only 9.87 nW. This yields an FOM of 23.7 fJ/conversion-step. Its leakage power consumption is 1.46 nW.
Subject
DRNTU::Engineering::Electrical and electronic engineering
Type
Conference Paper
Collections
http://dx.doi.org/10.1109/APCCAS.2012.6418956
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