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Related Concept Videos

Biasing of FET01:22

Biasing of FET

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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...
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Biasing of Metal-Semiconductor Junctions01:27

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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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Small-Signal Analysis of MOSFET Amplifiers01:23

Small-Signal Analysis of MOSFET Amplifiers

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In small-signal analysis, a MOSFET transistor amplifier acts as a linear amplifier when operating in its saturation region. The gate-to-source voltage (VGS) of the MOSFET is the sum of the DC biasing voltage and the small time-varying input signal. This combination sets up the operating point and modulates the drain current (ID) that flows from the drain to the source. When a small AC signal is superimposed on the DC bias voltage at the gate, the instantaneous drain current comprises three...
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MOSFET Amplifiers01:17

MOSFET Amplifiers

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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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Biasing of P-N Junction01:16

Biasing of P-N Junction

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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
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MOSFET: Enhancement Mode01:22

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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.
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Related Experiment Video

Updated: Sep 25, 2025

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
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Crosstalk mitigation and small-pitch consequences in SWIR InGaAs FPAs.

Andreu Glasmann, Enrico Bellotti

    Optics Express
    |April 27, 2022
    PubMed
    Summary

    Reducing pixel pitch in infrared imaging systems impacts performance. Introducing diffusion control junctions in SWIR InGaAs arrays lowers dark current and enhances modulation transfer function, optimizing focal plane array design.

    Area of Science:

    • Optoelectronics
    • Infrared Imaging Technology
    • Semiconductor Device Physics

    Background:

    • A significant trend in infrared imaging is the continuous reduction of pixel pitch in focal plane arrays (FPAs).
    • Smaller pixel pitches present challenges in maintaining optimal performance characteristics of FPAs.

    Purpose of the Study:

    • To numerically investigate the impact of reduced pixel pitch on key performance metrics of SWIR (Short-Wave Infrared) InGaAs FPAs.
    • To evaluate the effects on dark current, quantum efficiency, and modulation transfer function (MTF).

    Main Methods:

    • Conducted an extensive numerical study simulating SWIR InGaAs pixel arrays with varying pixel pitches.
    • Analyzed the correlation between pixel pitch reduction and changes in dark current, quantum efficiency, and MTF.

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    Main Results:

    • Reduced pixel pitch significantly affects dark current, quantum efficiency, and MTF in SWIR InGaAs FPAs.
    • The study identified specific performance degradations associated with smaller pixel dimensions.

    Conclusions:

    • Proposed the integration of diffusion control junctions into the pixel sub-architecture as a solution.
    • This modification effectively reduces dark current and improves MTF, despite a slight reduction in specific detectivity.
    • Diffusion control junctions offer a viable strategy for optimizing FPA performance with smaller pixel pitches.