A current mode instrumentation amplifier based on the flipped voltage follower in 0.50 µm CMOS
被引:0
|
作者:
Gregorio Zamora-Mejía
论文数: 0引用数: 0
h-index: 0
机构:Universidad Veracruzana,
Gregorio Zamora-Mejía
Jaime Martínez-Castillo
论文数: 0引用数: 0
h-index: 0
机构:Universidad Veracruzana,
Jaime Martínez-Castillo
José Miguel Rocha-Pérez
论文数: 0引用数: 0
h-index: 0
机构:Universidad Veracruzana,
José Miguel Rocha-Pérez
Alejandro Díaz-Sánchez
论文数: 0引用数: 0
h-index: 0
机构:Universidad Veracruzana,
Alejandro Díaz-Sánchez
机构:
[1] Universidad Veracruzana,
[2] Instituto Nacional de Astrofísica,undefined
[3] Óptica y Electrónica,undefined
来源:
Analog Integrated Circuits and Signal Processing
|
2016年
/
87卷
关键词:
Biopotential;
Current mode instrumentation amplifier CMIA;
Flipped voltage follower FVF;
Common mode rejection ratio CMRR;
Gain-bandwidth product GBW;
D O I:
暂无
中图分类号:
学科分类号:
摘要:
This work presents the design of a current mode instrumentation amplifier (CMIA) based on the flipped voltage follower (FVF), used as a double current sense mechanism. Unlike current state of the art, the proposed CMIA senses the sourced and sank current of the voltage follower buffer inside the Op-Amp inputs. The FVF low-impedance input node allows to monitor the sink current provided by the low-impedance drain node of the active load in the voltage follower buffer. Proposed CMIA uses Split-Length compensated op-amps at the inputs, and Nulling-Resistor compensation technique is used at the output Op-Amp. The proposed CMIA is able to provide continuous programmable gains from 16 to 56 dB by adjusting R2/R1\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$R_2/R_1$$\end{document} resistor ratios from 6.3 to 630 respectively. A gain-bandwidth product of 1.23 MHz and a common mode rejection ratio (CMRR) of 96 dB is obtained. A −3 dB CMRR cutoff frequency of 115 Hz is observed in all gain cases. An overall CMIA power consumption of 315.5 µW is measured; 95 µA at ±1.65 V. The proposed CMIA was simulated and fabricated using 0.50 µm ON-Semiconductor CMOS standard technology.