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A high output impedance current source
C W Denyer1, F J Lidgey, Q S Zhu
1EIT Research Group, Oxford Brookes University, UK.
Physiological Measurement
|May 1, 1994
Abstract:
A high output impedance current source was required for electrical impedance tomography (EIT) 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.