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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
PubMed
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A novel current source for electrical impedance tomography (EIT) achieves high output impedance up to 200 kHz. This design utilizes operational-amplifier current sensing for improved EIT system performance.

Area of Science:

  • Electrical Engineering
  • Biomedical Engineering
  • Instrumentation

Background:

  • Electrical Impedance Tomography (EIT) requires stable current sources for accurate imaging.
  • Existing current sources may face limitations in output impedance and frequency response for advanced EIT applications.

Purpose of the Study:

  • To develop a high output impedance current source suitable for EIT applications up to 200 kHz.
  • To characterize the output impedance and performance of the proposed current source architecture.

Main Methods:

  • The current source architecture is based on operational-amplifier power-supply current sensing.
  • Output impedance was measured and characterized at relevant frequencies.

Main Results:

Related Experiment Videos

  • A predominantly capacitive output impedance was achieved.
  • The designed current source exhibits an output impedance of approximately 1.2 pF at the target frequencies.

Conclusions:

  • The developed current source meets the high output impedance and frequency requirements for advanced EIT.
  • This architecture offers a viable solution for enhancing EIT system performance and imaging capabilities.