Title :
Floating voltage-controlled current sources for electrical impedance tomography
Author :
Hong, Hongwei ; Rahal, Mohamad ; Demosthenous, Andreas ; Bayford, Richard H.
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. Coll. London, London
Abstract :
The design of a current source for wideband electrical impedance tomography medical instrumentation is a challenging task. This paper describes two simple OTA-based floating voltage-controlled current sources (VCCSs) for this application. Both designs are suitable for VLSI implementation and overcome the drawbacks of existing opamp-based discrete VCCS designs. The floating VCCSs are designed to drive loads of 100 Omega to 2 kOmega with current amplitudes of up to 500 muA. The working frequency band is between 100 Hz to 1 MHz. Simulated results using a 0.35-mum CMOS process technology are presented to show the operation of the circuits.
Keywords :
CMOS integrated circuits; VLSI; computerised tomography; electric impedance imaging; operational amplifiers; CMOS process technology; OTA; VLSI implementation; floating voltage-controlled current sources; medical instrumentation; opamp-based discrete VCCS designs; wideband electrical impedance tomography; CMOS process; CMOS technology; Circuit simulation; Frequency; Impedance; Instruments; Tomography; Very large scale integration; Voltage; Wideband;
Conference_Titel :
Circuit Theory and Design, 2007. ECCTD 2007. 18th European Conference on
Conference_Location :
Seville
Print_ISBN :
978-1-4244-1341-6
Electronic_ISBN :
978-1-4244-1342-3
DOI :
10.1109/ECCTD.2007.4529573
