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An electrocardiography (ECG) machine is an essential piece of medical equipment used to monitor the electrical activity of the heart. It operates by detecting small electrical changes on the skin that result from the depolarization of the heart muscle during each heartbeat. However, these signals are in the microvolt range and can be easily overwhelmed by noise or interference.
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The MOSFET, when operating in its active region, functions as a voltage-controlled current source. In this region, the gate-to-source voltage controls the drain current. This principle underlies the operation of the transconductance MOSFET amplifier. The output current is directed through a load resistor to convert this amplifier into a voltage amplifier. The output voltage is then obtained by subtracting the voltage drop across the load resistance from the supply voltage. This process results...
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Measurement of Bioelectric Current with a Vibrating Probe
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Practical experiments with ultra-low voltage biomedical amplifiers.

Eric A Bharucha, Younes Messaddeq, Benoit Gosselin

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |December 3, 2025
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed low-voltage amplifiers essential for biomedical devices and analog computing. These amplifiers achieve useful gain at significantly reduced operational voltages, enhancing efficiency and device longevity.

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    Area of Science:

    • Electrical Engineering
    • Biomedical Engineering
    • Materials Science

    Background:

    • Low power amplifiers are critical for biomedical devices like muscle signal interfaces and neurological front ends.
    • Increasing demands in analog computing platforms highlight the need for efficient, low-voltage amplifiers.
    • Reducing operational voltage is imperative for low-power design in electronic circuits.

    Purpose of the Study:

    • To optimize and test two amplifier topologies for useful gain at low operational voltages.
    • To evaluate the performance of these amplifiers for applications in biomedical circuits.
    • To demonstrate the feasibility of low-voltage operation for advanced electronic systems.

    Main Methods:

    • Optimized two amplifier topologies: a CMOS body-input transconductance amplifier and a common-source (CS) amplifier using an array of MOSFETs.
    • Minimized voltage stack and maximized gain in the CS amplifier design.
    • Tested both amplifier designs with practical interface biasing to assess performance.

    Main Results:

    • The body amplifier achieved useful gain down to 290mV.
    • The CS amplifier provided suitable gain down to 190mV.
    • Both topologies demonstrated adequate gain for biomedical circuit applications.

    Conclusions:

    • Low-voltage, low-power amplifiers are vital for extending battery life and reducing risks in medical devices and implants.
    • These amplifiers are crucial for next-generation biomimetic computing systems utilizing analog memory.
    • The developed amplifier designs offer practical solutions for efficient low-voltage operation in various electronic applications.