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.
No takes yet. Share an insight, caveat, or question.
Denyer et al. (1994) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: