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Time and frequency -Domain Interpretation of Phase-lag Control01:21

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Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
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Polarography is a classical voltammetric technique used to analyze electrochemical reactions. This method applies a linear potential sweep to a dropping mercury electrode (DME), and the resulting current is measured. A dropping mercury electrode is commonly used as the working electrode in polarography. It consists of a capillary tube filled with mercury, where the tiny droplet forms at the tip. This droplet continuously drops from the capillary, creating a new electrode surface for each...
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Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
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Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
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Related Experiment Video

Updated: Jul 31, 2025

Voltage Biasing, Cyclic Voltammetry, & Electrical Impedance Spectroscopy for Neural Interfaces
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A Time-Domain Readout Technique for Neural Interfaces Based on VCO-Timestamping.

Fernando Cardes, Ebrahim Azizi, Andreas Hierlemann

    IEEE Transactions on Biomedical Circuits and Systems
    |May 10, 2023
    PubMed
    Summary

    This study introduces a novel readout technique for CMOS neural interfaces using voltage-controlled oscillators (VCOs) and digital timestamps. This scalable method efficiently records neural activity from thousands of electrodes with low noise.

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    Area of Science:

    • Neuroscience
    • Electrical Engineering
    • Biomedical Engineering

    Background:

    • CMOS neural interfaces are crucial for studying neuronal electrical activity and restoring nervous system functions.
    • Current interfaces require compact, low-power, low-noise circuits for simultaneous recording from thousands of electrodes.

    Purpose of the Study:

    • To propose and validate a novel readout technique for neural interfaces based on voltage-controlled oscillators (VCOs).
    • To demonstrate a scalable and efficient architecture for multi-channel neural recording.

    Main Methods:

    • Developed a readout technique utilizing VCOs where frequency modulation by input voltage is postprocessed into digital timestamps.
    • Implemented and tested a prototype in 0.18-microm CMOS technology.
    • Performed theoretical derivations, simulations, and experimental measurements.

    Main Results:

    • The proposed VCO-timestamping method relies primarily on digital circuitry, offering better scalability than analog approaches.
    • Digital circuitry can be shared across multiple VCOs, enhancing efficiency for multi-channel systems.
    • The prototype achieved a measured input-referred noise of 5.7 microVrms in the 300 Hz-5 kHz band and successfully detected extracellular action potentials.

    Conclusions:

    • The VCO-timestamping technique presents a promising, scalable, and efficient approach for next-generation neural interfaces.
    • This digital-centric method addresses the challenges of high-channel-count, low-power, and low-noise neural recording.