NDLI: A current mode instrumentation amplifier based on the flipped voltage follower in 0.50 µm CMOS

Content Provider	Springer Nature Link
Author	Zamora Mejía, Gregorio Martínez Castillo, Jaime Rocha Pérez, José Miguel Díaz Sánchez, Alejandro
Copyright Year	2016
Abstract	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 $$R_2/R_1$$ 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.
Starting Page	389
Ending Page	398
Page Count	10
File Format	PDF
ISSN	09251030
Journal	Analog Integrated Circuits and Signal Processing
Volume Number	87
Issue Number	3
e-ISSN	15731979
Language	English
Publisher	Springer US
Publisher Date	2016-04-12
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biopotential Current mode instrumentation amplifier CMIA Flipped voltage follower FVF Common mode rejection ratio CMRR Gain-bandwidth product GBW Circuits and Systems Electrical Engineering Signal, Image and Speech Processing
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Signal Processing Hardware and Architecture

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