NDLI: High-Power CMOS Current Driver With Accurate Transconductance for Electrical Impedance Tomography

Content Provider	IEEE Xplore Digital Library
Author	Constantinou, L. Triantis, I.F. Bayford, R. Demosthenous, A.
Copyright Year	2007
Abstract	Current drivers are fundamental circuits in bioimpedance measurements including electrical impedance tomography (EIT). In the case of EIT, the current driver is required to have a large output impedance to guarantee high current accuracy over a wide range of load impedance values. This paper presents an integrated current driver which meets these requirements and is capable of delivering large sinusoidal currents to the load. The current driver employs a differential architecture and negative feedback, the latter allowing the output current to be accurately set by the ratio of the input voltage to a resistor value. The circuit was fabricated in a 0.6-μm high-voltage CMOS process technology and its core occupies a silicon area of 0.64 mm². It operates from a ± 9 V power supply and can deliver output currents up to 5 mA p-p. The accuracy of the maximum output current is within 0.41% up to 500 kHz, reducing to 0.47% at 1 MHz with a total harmonic distortion of 0.69%. The output impedance is 665 kΩ at 100 kHz and 372 kΩ at 500 kHz.
Sponsorship	IEEE Circuits and Systems Society IEEE Engineering in Medicine and Biology Society
Starting Page	575
Ending Page	583
Page Count	9
File Size	1605796
File Format	PDF
ISSN	19324545
Volume Number	8
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Transconductance Impedance Transistors Resistors Current measurement Voltage measurement Topology high power design Accurate transconductance bioimpedance CMOS circuits current driver electrical impedance tomography (EIT)
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Biomedical Engineering

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