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