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Two-electrode low supply voltage electrocardiogram signal amplifier.
1Centre of Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria. ikdas@argo.bas.bg
Medical & Biological Engineering & Computing
|May 6, 2004
Summary
This study presents a low-voltage, two-electrode biopotential amplifier for portable biomedical devices. The design offers high common-mode rejection ratio and input voltage tolerance, crucial for telemedicine applications.
Area of Science:
- Biomedical Engineering
- Electrical Engineering
- Circuit Design
Background:
- Portable biomedical instrumentation is vital for diagnostics, treatment, and telemedicine.
- Modern portable devices require low-voltage and low-power circuit solutions, often powered by 3-3.6 V batteries.
Purpose of the Study:
- To present a novel two-electrode biopotential amplifier design.
- To achieve high common-mode rejection ratio (CMRR) and input voltage tolerance for portable biomedical applications.
Main Methods:
- Designed a two-electrode biopotential amplifier utilizing a high-gain first stage.
- Employed passive components with popular values and tolerances for circuit construction.
- Powered the amplifier using a single 3 V source.
Main Results:
- The amplifier achieves a worst-case CMRR of 60 dB.
- It demonstrates tolerance to +/- 1 V common mode voltage and +/- 50 microA common mode current.
- The circuit can withstand up to 2 V input DC voltage.
Conclusions:
- The developed biopotential amplifier is suitable for low-voltage, low-power portable biomedical instrumentation.
- Its robust performance characteristics make it ideal for applications like Holter monitors, defibrillators, and ECG devices.
- The design leverages standard components, facilitating practical implementation in telemedicine and biotelemetry.