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[Study on double feedback current source for biologic impedance measurement].

Chao Wang1, Xiangyu Wang, Hongjun Sun

  • 1School of Electrical and Automation Engineering, Tianjin University, Tianjin 300072, China. wangchao@tju.edu.cn

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi = Journal of Biomedical Engineering = Shengwu Yixue Gongchengxue Zazhi
|September 28, 2006
PubMed
Summary
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A novel double feedback current source enhances biologic impedance measurements by improving high-frequency constant-current characteristics and eliminating direct current signals. This design ensures accurate measurements for advanced biomedical applications.

Area of Science:

  • Biomedical Engineering
  • Electronics Engineering

Context:

  • Biologic impedance measurement requires stable current sources, especially at higher frequencies.
  • Existing current sources struggle with constant-current characteristics and direct current (DC) signal interference.

Purpose:

  • To design a double feedback current source for improved biologic impedance measurement.
  • To address poor constant-current characteristics at higher frequencies.
  • To enable the elimination of direct current signals.

Summary:

  • A voltage-controlled current source utilizing second-generation current conveyor theory is presented.
  • It incorporates a DC feedback unit and input buffer for enhanced output impedance and anti-DC characteristics.
  • Closed-loop control of current amplitude via direct digital synthesizer and multiplication demodulation improves constant-current performance.

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Impact:

  • Enables more accurate and reliable biologic impedance measurements.
  • Facilitates advanced biomedical research and diagnostic tools.
  • Offers a robust solution for high-frequency impedance spectroscopy.