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Related Concept Videos

RC Circuits: Charging A Capacitor01:30

RC Circuits: Charging A Capacitor

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A circuit containing resistance and capacitance is called an RC circuit. A capacitor is an electrical component that stores electric charge by storing energy in an electric field. Consider a simple RC circuit having a DC (direct current) voltage source ε, a resistor R, a capacitor C, and a two-way position switch. In the circuit, the capacitor can be charged or discharged depending on the position of the switch.
When the switch is moved to connect the battery, the circuit reduces to a simple...
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Energy Stored in a Capacitor01:12

Energy Stored in a Capacitor

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When an archer pulls the string in a bow, he saves the work done in the form of elastic potential energy. When he releases the string, the potential energy is released as kinetic energy of the arrow. A capacitor works on the same principle in which the work done is saved as electric potential energy. The potential energy (UC) could be calculated by measuring the work done (W) to charge the capacitor.
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Energy Stored in Capacitors01:10

Energy Stored in Capacitors

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A parallel plate capacitor, when connected to a battery, develops a potential difference across its plates. This potential difference is key to the operation of the capacitor, as it determines how much electrical energy the capacitor can store.
By integrating the equation that relates voltage and current in a capacitor, one can derive an equation for the voltage across the capacitor at any given time. This equation is crucial in understanding and predicting the behavior of capacitors in...
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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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RC Circuits: Discharging A Capacitor01:27

RC Circuits: Discharging A Capacitor

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One of the applications of an RC circuit is the relaxation oscillator. The relaxation oscillator comprises a voltage source, a capacitor, a resistor, and a neon lamp. The lamp acts like an open circuit (infinite resistance) until the potential difference across the neon lamp reaches a specific voltage. At that voltage, the lamp acts like a short circuit (zero resistance), and the capacitor discharges through the neon lamp and produces light. Once the capacitor is fully discharged through the...
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Energy Stored in a Capacitor: Problem Solving01:26

Energy Stored in a Capacitor: Problem Solving

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In 1749, Benjamin Franklin coined the word battery for a series of capacitors connected to store energy. Capacitors store electric potential energy that can be released over a short time. This property means capacitors have a wide range of applications.
Capacitor-discharge ignition is a type of ignition system commonly found in small engines where the energy released from a capacitor ignites an induction coil that, in turn, fires the spark plug.
To calculate the energy stored in a capacitor of...
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Compact, Energy-Efficient High-Frequency Switched Capacitor Neural Stimulator With Active Charge Balancing.

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    This study introduces a novel high-frequency, switched capacitor (HFSC) stimulation method for implantable neural stimulators, improving energy efficiency and charge control. The compact HFSC design enhances safety and enables multichannel stimulation.

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    Area of Science:

    • Biomedical Engineering
    • Neural Engineering
    • Implantable Devices

    Background:

    • Safety and energy efficiency are critical challenges for implantable neural stimulators.
    • Variations in electrode impedance can compromise stimulation control and device longevity.
    • Existing stimulation methods face limitations in efficiency and adaptability.

    Purpose of the Study:

    • To present a novel high-frequency, switched capacitor (HFSC) stimulation and active charge balancing scheme.
    • To enhance energy efficiency and achieve precise charge control for neural stimulators.
    • To enable compact, multichannel stimulation capabilities for implantable devices.

    Main Methods:

    • Developed a high-frequency, switched capacitor (HFSC) stimulation and active charge balancing circuit.
    • Integrated the HFSC stimulator using 0.18 μm high-voltage technology.
    • Performed theoretical analysis and experimental validation of the proposed scheme.

    Main Results:

    • Achieved 50% peak energy efficiency.
    • Demonstrated well-controlled stimulation charge despite large electrode impedance variations.
    • Confirmed the effectiveness of active charge balancing in preventing electrode dissolution.
    • Fabricated a compact single stimulator occupying 0.035 mm².

    Conclusions:

    • The proposed HFSC stimulation scheme offers significant advantages over traditional constant-current and voltage-mode methods.
    • The compact and efficient design facilitates multichannel stimulation for advanced neural interfaces.
    • The active charge balancing ensures device safety and longevity, crucial for implantable applications.