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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...
337
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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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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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.
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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Field Effect Transistor01:29

Field Effect Transistor

504
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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Small-Signal Analysis of MOSFET Amplifiers01:23

Small-Signal Analysis of MOSFET Amplifiers

639
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...
639
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

876
In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
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Fluxgate Sensor with Bifactor Excitation Mode.

Ivan V Bryakin1, Igor V Bochkarev2, Vadim R Khramshin3

  • 1Laboratory of Information and Measuring Systems, National Academy of Sciences of the Kyrgyz Republic, Bishkek 720010, Kyrgyzstan.

Sensors (Basel, Switzerland)
|February 28, 2023
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Summary

This study introduces a novel magnetic-field non-destructive testing (NDT) method for flaw detection in magnetic products. It eliminates the need for pre-magnetization, offering improved accuracy and cost-effectiveness.

Keywords:
acoustic waveseddy currentselectromagnetic acoustic effectelectromagnetic fieldfluxgate converterfluxgate sensorpermeability modulationvariable magnetic field strength

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Area of Science:

  • Materials Science
  • Non-Destructive Testing (NDT)
  • Electromagnetism

Background:

  • Conventional magnetic flaw detection requires pre-magnetization of materials.
  • Existing NDT methods face limitations in flaw detection accuracy and resolution.
  • Accurate flaw detection is crucial for the integrity of magnetic products.

Purpose of the Study:

  • To propose a new probe-coil magnetic-field non-destructive testing (NDT) technique.
  • To develop an NDT method that does not require pre-magnetization of the test object.
  • To enhance the reliability and cost-effectiveness of flaw detection in magnetic products.

Main Methods:

  • Theoretical justification of a new bifactor excitation for fluxgate sensors.
  • Simultaneous activation of magnetic-modulating and electromagnetic-acoustic effects.
  • Design and analysis of a novel fluxgate sensor with bifactor excitation.
  • Experimental study of the proposed fluxgate sensor's capabilities.

Main Results:

  • The new NDT technique successfully detects flaws without pre-magnetization.
  • The bifactor excitation method enhances fluxgate sensor performance.
  • Experimental results confirm high resolution, reduced uncertainty, and detection of smaller, deeper flaws.
  • The novel fluxgate design offers improved functionality and lower cost.

Conclusions:

  • The proposed magnetic-field NDT method offers a significant advancement over conventional techniques.
  • The new bifactor excitation fluxgate sensor provides superior flaw detection capabilities.
  • This technology promises more reliable and cost-effective inspection of magnetic products.