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Related Concept Videos

Open and closed-loop control systems01:17

Open and closed-loop control systems

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Control systems are foundational elements in automation and engineering. They are broadly categorized into open-loop and closed-loop systems. These classifications hinge on the presence or absence of feedback mechanisms, significantly influencing the system's performance, complexity, and application.
An open-loop control system operates without feedback from the output. It consists of two primary elements: the controller and the controlled process. The controller receives an input signal...
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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
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Semiconductors01:22

Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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Biasing of FET01:22

Biasing of FET

223
Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
223
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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MOS Capacitor01:25

MOS Capacitor

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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
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Real-Time Proxy-Control of Re-Parameterized Peripheral Signals using a Close-Loop Interface
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A Cyto-Silicon Hybrid System with On-Chip Closed-Loop Modulation.

Jun Wang, Seok Joo Kim, Wenxuan Wu

    IEEE Transactions on Biomedical Circuits and Systems
    |September 23, 2024
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    Summary
    This summary is machine-generated.

    Researchers developed a novel bioelectronic interface enabling low-latency, closed-loop communication between biological cells and a CMOS chip. This system creates artificial signal pathways for advanced applications in prosthetics and brain-machine interfaces.

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    Area of Science:

    • Bioelectronic interfaces
    • Neuroscience
    • Biotechnology

    Background:

    • Biological cells generate electrical signals crucial for physiological functions.
    • Current interfaces often lack the speed and integration for complex biological system modulation.
    • Developing seamless integration between biological and electronic systems is a key challenge.

    Purpose of the Study:

    • To create a bioelectronic interface for real-time, closed-loop communication between electrogenic cells and a mixed-signal CMOS integrated circuit.
    • To demonstrate the utility of this interface for creating artificial signal pathways between biological cells.
    • To explore applications in areas like prosthetics and brain-machine interfaces.

    Main Methods:

    • Utilized a 1,024-channel CMOS electrode array for simultaneous recording and stimulation of biological cells.
    • Implemented on-chip closed-loop modulation with intrinsic latency under 5 µs.
    • Developed a silicon-cardiomyocyte oscillator and a silicon-neuron interface to showcase artificial feedback pathways.

    Main Results:

    • Successfully established a bioelectronic interface with high-density recording and stimulation capabilities.
    • Demonstrated low-latency, on-chip closed-loop modulation for artificial signal pathways.
    • Created functional hybrid systems, including a tunable silicon-cardiomyocyte oscillator and a silicon-neuron inhibitory connection.

    Conclusions:

    • The developed cyto-silicon hybrid system effectively blurs the lines between biological and semiconductor systems.
    • The low-latency, closed-loop interface enables novel artificial feedback pathways for biological cells.
    • Potential applications include advanced prosthetics, brain-machine interfaces, and fundamental biological research.