High-Accuracy Impedance Read-out Circuit for BIA-type Biomedical Sensors

Senior Member IEEE

Research output: Contribution to journalArticlepeer-review


An impedance read-out circuit with high accuracy implemented using a TSMC 0.18 um mixed-signal CMOS process for BIA-type (bio-electrical impedance analysis) sensors to detect biomarkers is proposed in this investigation. In addition to proposing the impedance estimation circuit, the associated analytic proof is also disclosed. Using a high-order approximation model and high noise rejection capability by the addition of OPAs (operational amplifiers), the proposed system demonstrates a solution with high accuracy in terms of the maximum impedance error (< 6 %) and the least phase error (< 3) in a frequency range from 1 kHz to 2 MHz.

Original languageEnglish
Pages (from-to)4187-4195
Number of pages9
JournalCircuits, Systems, and Signal Processing
Issue number9
Publication statusPublished - 2021 Sept

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Applied Mathematics


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