Design of OTAs for Ultra-Low-Power Sigma-Delta ADCs in Medical Applications

被引：0

作者：

Yeknami, Ali Fazli ^{[1
]}

Qazi, Fahad ^{[1
]}

Dabrowski, Jerzy J. ^{[1
]}

Alvandpour, Atila ^{[1
]}

机构：

[1] Linkoping Univ, Dept Elect Engn, S-58183 Linkoping, Sweden

来源：

INTERNATIONAL CONFERENCE ON SIGNALS AND ELECTRONIC SYSTEMS (ICSES '10): CONFERENCE PROCEEDINGS | 2010年

关键词：

MODULATOR;

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

High-resolution sigma-delta ADCs are gaining significant interest in ultra-low-power medical applications, where accurate measurement of low-frequency and weak electrophysiological signals is required. Operational transconductance amplifiers (OTA) are the key analog component and the most power-hungry part of the sigma-delta (Sigma Delta) modulators. This paper presents a study of OTAs for ultra-low-power operation, including design and a comparative analysis of four OTA architectures implemented in 65nm CMOS Technology. The requirements for OTA gain and GBW are driven in terms of Sigma Delta ADC specifications. The OTAs' impact on modulator SNR has been investigated by simulation. The results show that a two-stage OTA with load compensation yields highest SNR and lowest power dissipation amongst the four OTAs in this study.

引用

页码：229 / 232

页数：4

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