Field Effect Transistors
Field Effect Transistors - Related Videos
01:29
Field Effect Transistor
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2024
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...
11:25
Preparation of Silicon Nanowire Field-effect Transistor for Chemical and Biosensing Applications
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Cited by 4 •
2016
We describe key steps for biosensing by using polysilicon nanowire field-effect transistors, including the preparation of the device and the immobilization and confirmation of a DNA molecular probe on the nanowire surface, as well as conditions for DNA sensing.
08:43
Effect of Bending on the Electrical Characteristics of Flexible Organic Single Crystal-based Field-effect Transistors
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Cited by 1 •
2016
This manuscript describes the bending process of an organic single crystal-based field-effect transistor to maintain a functioning device for electronic property measurement. The results suggest that bending causes changes in the molecular spacing in the crystal and thus in the charge hopping rate, which is important in flexible electronics.
07:51
Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
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Cited by 2 •
2022
The present protocol demonstrates the development of electrolyte-gated graphene field-effect transistor (EGGFET) biosensor and its application in biomarker immunoglobulin G (IgG) detection.
11:17
Sensing of Barrier Tissue Disruption with an Organic Electrochemical Transistor
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Cited by 5 •
2014
The Organic Electrochemical Transistor is integrated with live cells and used to monitor ion flux across the gastrointestinal epithelial barrier. In this study, an increase in ion flux, related to disruption of tight junctions, induced by the presence of the calcium chelator EGTA (ethylene glycol-bis(beta-aminoethyl ether)-N,N,N',N'-tetra acetic acid), is measured.
FAQs
Gate voltage alters the conductivity of the channel between the source and drain by attracting or repelling charge carriers. This electrical control changes how readily current can pass through the device. In circuit design, engineers use that relationship to regulate conduction without needing to control the channel through a direct current path.
The insulating layer separates the gate from the channel while allowing the gate voltage to influence channel conductivity. This separation supports high input impedance, meaning the gate draws very little current. That characteristic contributes to efficient circuit operation and makes MOSFETs useful where the control signal should impose minimal electrical loading.
A FET can function as a switch when its gate voltage controls whether the channel conducts, allowing circuits to represent changing logic states. It can also serve as an amplifier when variations in gate voltage produce corresponding changes in channel current. These two operating roles support digital logic as well as signal-processing systems.
Low gate current, scalability, and efficient operation are central engineering advantages. Low gate current helps reduce the control power required, while scalability supports increasingly compact circuit structures. Together, these characteristics have enabled FET-based integrated circuits to become more densely integrated and important in modern electronic technologies.
Engineers apply FETs in digital logic, memory, power electronics, sensors, and signal-processing systems. The same voltage-controlled behavior can therefore support information storage, power control, sensing functions, and manipulation of electrical signals. Their use across these areas reflects the flexibility of the device rather than dependence on a single circuit function.
The intended circuit function provides the starting point: switching behavior suits digital logic and memory, while controlled current changes support amplification and signal processing. Power electronics, sensors, and compact integrated circuits place the device in different system contexts. Engineers can then consider low gate current, scalability, and efficient operation as relevant design advantages.