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A 155-dB Dynamic Range Current Measurement Front End for Electrochemical Biosensing.
IEEE Transactions on Biomedical Circuits and Systems
|November 16, 2016
Summary
This study presents an ultra-wide dynamic range current measurement system using CMOS technology. The novel dual-mode design offers precise voltage and frequency outputs for sensitive applications.
Area of Science:
- Electrical Engineering
- Instrumentation and Measurement
Background:
- Accurate current measurement is crucial for analyzing complex systems.
- Existing systems often lack the dynamic range or integrated functionality for diverse applications.
Purpose of the Study:
- To develop an integrated current measurement system with an ultra-wide dynamic range.
- To enable concurrent voltage and frequency outputs without external clocking.
Main Methods:
- Fabrication in 180-nm CMOS technology.
- Implementation of a dual-mode design featuring an integrator-differentiator core and an asynchronous current-to-frequency converter.
Main Results:
- Achieved a noise floor of 11.6 fA/sqrt(Hz) and a -3 dB cutoff frequency of 1.4 MHz.
- Demonstrated a 155 dB current measurement range from 204 fA to 11.6 μA.
- Concurrent voltage and frequency outputs were obtained without an external clock.
Conclusions:
- The integrated system offers a wide dynamic range, low noise, and wide bandwidth.
- Ideal for precise measurements in highly nonlinear electrochemical and electrophysiological systems.
- The dual-mode design enhances versatility and simplifies system integration.
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