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Related Concept Videos

Biasing of FET01:22

Biasing of FET

443
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...
443
Characteristics of MOSFET01:17

Characteristics of MOSFET

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Metal-oxide-semiconductor field-effect Transistors, or MOSFETs, play a critical role in electronic circuits. They are primarily utilized for amplifying and switching signals.
Various vital parameters influence their functionality, which is crucial for theory and electronics applications. First, channel dimensions, precisely length, and width, are pivotal. The size of these channels affects the transistor's ability to carry current and switching speeds; shorter channels typically enable...
632
Field Effect Transistor01:29

Field Effect Transistor

771
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...
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MOSFET01:16

MOSFET

768
The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
In an n-MOSFET, the structure includes n-type source and drain...
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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

571
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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MOSFET Amplifiers01:17

MOSFET Amplifiers

300
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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In Vitro Multiparametric Cellular Analysis by Micro Organic Charge-modulated Field-effect Transistor Arrays
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Surface Potential-Controlled Oscillation in FET-Based Biosensors.

Ji Hyun Kim1, Seong Jun Park1, Jin-Woo Han2

  • 1Department of Electronic Engineering, Kwangwoon University, Seoul 01897, Korea.

Sensors (Basel, Switzerland)
|April 3, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method to convert surface potential into oscillation frequency for field-effect transistor (FET) biosensors. This innovation enables simpler, portable point-of-care diagnostics for chemical and biological detection.

Keywords:
chemical and biological sensorextended gatefield-effect transistoroscillation frequencypH sensorring oscillatorsurface potential

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Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Materials Science

Background:

  • Field-effect transistor (FET)-based biosensors offer label-free electrical detection of charged biomolecules.
  • Conventional FET biosensor outputs (threshold voltage, channel current) require complex instrumentation, limiting point-of-care applications.
  • There is a need for simplified readout mechanisms for FET biosensors suitable for portable diagnostics.

Purpose of the Study:

  • To develop a simple conversion method for transforming surface potential into an oscillating signal for FET biosensors.
  • To propose oscillation frequency as a novel, advantageous output parameter for FET biosensors.
  • To enable portable, real-time point-of-care testing applications.

Main Methods:

  • An extended-gate FET biosensor with an Al2O3 sensing electrode was connected to a ring oscillator.
  • The ring oscillator generated surface potential-controlled oscillations for pH sensing.
  • Electrical measurements, analytical calculations, and circuit simulations were used to investigate circuit parameters and pH sensitivity.

Main Results:

  • The oscillation frequency was successfully demonstrated as a sensitive and reliable output parameter for FET biosensors.
  • A direct correlation between oscillation frequency and threshold voltage was confirmed.
  • The proposed sensor integrated with an Arduino board enabled portable, real-time pH measurement.

Conclusions:

  • Converting surface potential to oscillation frequency offers a simple and compact readout for FET biosensors.
  • Oscillation frequency is a viable alternative to conventional parameters, enhancing compatibility with neuromorphic applications.
  • The developed system facilitates practical point-of-care testing for chemical and biological species.