A high output impedance current source.
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.
Denyer
C W
CW
EIT Research Group, Oxford Brookes University, UK.
Lidgey
F J
FJ
Zhu
Q S
QS
McLeod
C N
CN
D000669:Amplifiers, Electronic; D017097:Electric Impedance; D004581:Electronics; D014054:Tomography / Q000295:instrumentation*