A high output impedance current source

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Published under licence by IOP Publishing Ltd
, , Citation C W Denyer et al 1994 Physiol. Meas. 15 A79 DOI 10.1088/0967-3334/15/2A/011

0967-3334/15/2A/A79

Abstract

A high output impedance current source was required for electrical impedance tomography applications capable of operating up to 200 kHz. The architecture is based on operational-amplifier power-supply current sensing and produces a predominantly capacitive output impedance, which for the design presented is approximately 1.2 pF.

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