Low-voltage high CMRR OTA for electrophysiological measurements

被引：1

作者：

Mitra, Srinjoy ^{[1
]}

Zele, Rajesh ^{[2
]}

Etienne-Cummings, Ralph ^{[1
]}

机构：

[1] Johns Hopkins Univ, Elect & Comp Engn Dept, Baltimore, MD 21218 USA

[2] Alereon Inc, Austin, TX USA

来源：

ISCAS: 2009 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOLS 1-5 | 2009年

基金：

瑞士国家科学基金会;

关键词：

MODE REJECTION RATIO;

D O I：

10.1109/ISCAS.2009.5117756

中图分类号：

TP [自动化技术、计算机技术];

学科分类号：

0812 ;

摘要：

With the advent of miniaturised sensors for various engineering and medical applications there is an increased demand of low-power, low-voltage analog building blocks like opamps and OTAs. Degradation of certain amplifier characteristics with supply voltage is a major concern for low-voltage design and often poses contradictory requirement. CMRR (common mode rejection ratio), one such feature, is essential for sensing small bio-electric signals riding over large common-mode voltage. Here we focus on the challenging task of building a low-voltage OTA with high CMRR along with wide CMRR (common mode range) and high output impedance. Robust tail current sources for a complementary differential pair OTA with folded cascode output is implemented for the purpose. The circuits are designed and simulated in 0.35 mu m standard CMOS technology with supply voltage of 1.8V. We could demonstrate a maximum of upto 40dB increase in CMRR for a range of common-mode voltages.

引用

页码：345 / +

页数：2