ELECTRONICS

EIS Precision Amplifier Circuit

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UPDATED 2026-06-29
EXAMPLEEIS Precision Amplifier Circuit
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CASE ANALYSIS

Scenario

An Apple Watch biosensor requires electrochemical impedance spectroscopy to characterize electrode-tissue interface. A precision amplifier measures nanoamp currents while a frequency sweep generator probes multiple frequencies.

Key decisions

  • Adopted three-electrode potentiostat topology
  • Modeled electrochemical cell as Randles circuit
  • Used a transimpedance amplifier with gain resistor for current-to-voltage conversion

When to reuse this

Suitable for any low-current AC impedance measurement in wearable biosensors, corrosion monitoring, or battery health assessment.

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