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You report the federal excise tax on the use of certain trucks, truck tractors, and buses used on public highways on Form 2290, Heavy Highway Vehicle Use Tax Return. The tax applies to highway motor vehicles with a taxable gross weight of 55,000 pounds or more. Because a reasonably high dose of estrogen is taken from day 2 of your cycle in an FET protocol, the hormone is a down-regulator and prevents ovulation. FET (Field-Effect Transistor) Basics Field-Effect Transistors (FETs) are unipolar devices, and have two big advantages over bipolar transistors: one is that they have a near-infinite input resistance and thus offer near-infinite current and power gain; the other is that their switching action is not marred by charge-storage problems, and they thus outperform most bipolars in terms of digital switching speeds.
Advantages of FET | disadvantages of FET
This page covers advantages and disadvantages of FET. It mentions FET advantages or benefits and FET disadvantages or drawbacks.
What is FET?
Introduction:
FET is the short form of Field Effect Transistor.It is called unipolar transistor as current flow is carried out by majority charge carriers only.FET transistor is controlled by voltage rather than current unlike BJT.
Refer FET versus BJT >>.Following are the advantages of FET over BJT.
Based on the principle of operation and construction,FETs are classified as follows.
• JFET-Junction Field Effect Transistor
• MESFET-Metal Semiconductor Field Effect Transistor
• HEMT-High Electron Mobility Transistor
• MOSFET-Metal Oxide Semiconductor Field Effect Transistor
Benefits or advantages of FET
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Following are the benefits or advantages of FET:
➨High input resistance
➨Low noise figure
➨High efficiency as compare to BJT
➨Operating frequency range is higher compare to conventional BJT transistor.
Drawbacks or disadvantages of FET
Following are the disadvantages of FET:
➨It has relatively lower gain-bandwidth product compare to BJT.
➨Transconductance is low and hence voltage gain is low.
➨FET has slower switching timescompare to BJT.The internal junction capacitance of FET is responsible forhigh delay times.
➨FET performance degrades as frequency increases.This is due to the feedback by internal capacitance.
➨They are more costly compare to junction transistors.
➨FET of MOSFET type is very susceptible to overload voltages,hence special handling is required during installation.
➨In MOSFET, the layer between Gate and Channel is very fragile which is vulnerable toelectro-static damage during installation. Once it is installed in a well designed circuit,there is no issue found.
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FET Applications:
What are the various applications of the Field Effect Transistor?
In this short post let us discuss about the various applications of FET - Field Effect Transistor. Before proceeding further it is good to refresh about the basics of FET.
The Field Effect Transistor (FET) is a semiconductor device which depends for its operation on the control of current by an electric field. Thus it is called as FET.
There are two types FET
- Junction Field Effect Transistor (JFET) or simply FET.
- Insulated Gate Field Effect Transistor IGFET.
It is also called as Metal Oxide Semiconductor (MOS) transistor or MOSFET.
Applications of Field Effect Transistor (FET):
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- FET has high input impedance and low output impedance. So it is used as a buffer in measuring instruments, receivers.
- FET has low noise operation. So it is used in RF amplifiers in FM tuners and communication equipment.
- FET has low input capacitance, so it is used in cascade amplifiers in measuring and test equipment.
- Since FET is a voltage controlled device, it is used as a voltage variable resistor in operational amplifiers and tone controls.
- FET has low inner modulation distortion. So it is used in mixer circuits in FM and TV receivers, and communication equipment.
- Since it is low-frequency drifts, it is used in oscillator circuits.
- FETs are used in low-frequency amplifiers in hearing aids and inductive transducers, as the coupling capacitor is small.
- Since FET occupying less space and easy to fabricate, it is used in digital circuits in computers, LSD and memory circuits.
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