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Related Concept Videos

Field Effect Transistor01:29

Field Effect Transistor

Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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 current...
Small-Signal Analysis of MOSFET Amplifiers01:23

Small-Signal Analysis of MOSFET Amplifiers

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...
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

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...
MOSFET Amplifiers01:17

MOSFET Amplifiers

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...
Biasing of FET01:22

Biasing of FET

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 gate...

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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
15:47

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

High gain optical detection with GaAs field effect transistors.

R I Macdonald

    Applied Optics
    |March 24, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Gallium arsenide (GaAs) field effect transistor (FET) optical detectors show high responsivity for optical communications up to 100 MHz. These detectors offer excellent performance at low bias voltages.

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    Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
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    Published on: November 1, 2013

    Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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    Published on: April 1, 2020

    Area of Science:

    • Optoelectronics
    • Semiconductor Devices
    • Optical Communications

    Background:

    • Gallium arsenide (GaAs) field effect transistor (FET) optical detectors are crucial components in modern optical communication systems.
    • Existing photodetectors like P-I-N and avalanche photodiodes have limitations in certain performance aspects.

    Purpose of the Study:

    • To investigate the photoresponse of GaAs FET optical detectors under optical intensity modulation signals at moderate frequencies.
    • To evaluate the suitability of GaAs FET optical detectors for optical communication applications.

    Main Methods:

    • Characterization of the photoresponse of GaAs FET optical detectors.
    • Measurement of ac responsivity and noise equivalent power (NEP) at various frequencies.
    • Analysis of the frequency response slope in relation to optical bias power.

    Main Results:

    • High ac responsivity exceeding 6 A/W was achieved up to 100 MHz.
    • A noise equivalent power (NEP) of less than 10(-12) W/sqrt(Hz) was recorded.
    • The frequency response slope was found to be dependent on optical bias power, suggesting the influence of trap states.

    Conclusions:

    • GaAs FET optical detectors provide high photoresponse at low bias voltages, complementing existing photodetector technologies.
    • These detectors are well-suited for optical communication frequencies of interest.
    • The observed dependence of frequency response on optical bias power highlights the role of traps in device performance.