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what is MOSFET ?
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•MOSFET is a type of Field Effect Transistor (FET).

•It is a voltage controlled transistor.

•MOSFET have very high input impedance.

•It can be use with very low current circuits.

•It is very fast switching device.

•It is also use for amplifying signals.

•It is useful in low power high frequency converter applications.

•It is use in memory and ICs and processors and various faster switching application.

•It basically consists of 4 terminals out of which two terminals are connected to each other i.e. drain and body.

•Its operation based on flow of majority charged carrier only.

•It is a unipolar device.

•It form a parallel plate capacitor with gate oxide layer.

•It have problem of electrostatics discharge.

•The gate draws a very small leakage current in the order of Nano ampere.

•There are two types of MOSFET one is enhancement mode and second is depletion mode.

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Because of positive temperature coefficient of mosfet the paralleling of mosfet is easier.

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Yes MOSFET can operate at very high frequency.

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What is channel length modulation in MOSFET?

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What is depletion type MOSFET?..........

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Depletion MOSFET: Depletion MOSFET is a MOSFET in which the channel already exists. If we apply a voltage between drain and source then the drain current will flow even if the gate to source ... in figure. The drain current will be reduced as the gate to source voltage made more negative.

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What is enhancement MOSFET?...............

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Enhancement MOSFET: There are two types of MOSFET one is enhancement MOSFET and second is depletion MOSFET. In enhancement MOSFET channel is created by applying threshold voltage between gate and source ... mode. The enhancement MOSFET will not conduct if the gate to source voltage is zero.

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State advantages of MOSFET.

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Advantages of MOSFET * MOSFETs provide greater efficiency while operating at lower voltages. * Absence of gate current results in high input impedance. * High switching speed. * They operate at lower ... due to lower resistance of channel. * They are easy to manufacture. * They are portable.

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State the applications of MOSFET

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Describe the operation of N channel enhancement type MOSFET with diagram.

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As its name indicates, this MOSFET operates only in the enhancement mode and has no depletion mode. It operates with large positive gate voltage only. It does not conduct when the ... of charge carriers attracted to the positive gate. Thus drain current is controlled by the gate potential.

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A certain power MOSFET has a maximum junction temperature specification of 1500o C, a junction-to-case thermal resistance of 1.00 C/W, and a junction-to ambient thermal resistance of 600 C/W. If the ambient temperature is 300o C, then the maximum allowable power dissipation in the device will be A) 1.52 W B) 1.72 W C) 1.92W D) 2.00 W

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A certain power MOSFET has a maximum junction temperature specification of 1500o C, a junction-to-case thermal resistance of 1.00 C/W, and a junction-to ambient thermal resistance of  ... 300o C, then the maximum allowable power dissipation in the device will be 2.00 W 

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The threshold voltage of an n- channel enhancement mode MOSFET is 0.5V when the device is biased at a gate voltage of 3V. Pinch off would be occurs at a drain voltage of 2.5V

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A MOSFET has how many terminals?

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A MOSFET having three terminals 1st one is Gate (insulated), 2nd one is Source and 3rd one is Drain.

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How can we check a Mosfet?

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Why Mosfet is called Mosfet?

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In MOSFET, the polarity of the inversion layers is the same as that of?

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In MOSFET, the polarity of the inversion layers is the same as that of majority carriers in the source.

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MOSFET uses the electric field of gate capacitance.

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Is the input impedance of MOSFET more than BJT and FET?

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Yes, the input impedance of MOSFET more than BJT and FET.

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Explain the formation of parasitic BJT and parasitic diode in Power MOSFET. Can parasitic diode be used in same power electronics applications?

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Justify the statement. Antiparallel diode is connected across MOSFET.

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parallel operation of MOSFET can be done more easily as compared to thyristor. why?

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Justify. Power MOSFET is operated at high enough gate source voltage to minimize the conduction losses. 

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Explain difference between enhancement MOSFET and depletion type MOSFET.

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In enhancement MOSFET channel is not initially exists but in depletion MOSFET channel is already exists. In case of depletion MOSFET if the voltage is applied between drain and source the drain current will flow ... a channel. depletion MOSFET & enhancement MOSFET

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Compare BJT, MOSFET and IGBT .

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BJT MOSFET IGBT BJT is a current controlled device. MOSFET is a voltage controlled device. IGBT is a voltage controlled device. The input impedance of BJT is low. ... is minority carrier device. MOSFET is majority carrier device. IGBT is minority carrier device.

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Explain the series and parallel operation of MOSFET. Which is suitable and why?

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Series operation of MOSFET: To increase voltage handling capability MOSFETs are connected in series. When the MOSFETs are connected in series each MOSFET should turn on and turn off ... on and turn off time and transconductance. Each MOSFET should share current equally.  

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Because it has a higher switching frequency and heat tolerance.

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ON state losses of IGBT is less as compared to MOSFET and BJT.

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No, MOSFET is not the curent controlled device. The current between drain and source which is drain current is controlled by applying a voltage between gate and source hence MOSFET is a voltage controlled device. 

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already answered here is mosfet current controlled device?

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MOSFET provides better efficiency at high frequency and its high speed switching losses are less hence MOSFET is used for high frequency.

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Compared to MOSFET operational amplifier, BJT operational amplifier has  A) Higher input resistance B) Higher slew rate C) Lower input current D) Higher voltage gain

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What are the main constructional differences between a MOSFET and a BJT? What effect do they have on the current conduction mechanism of a MOSFET? 

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A MOSFET like a BJT has alternating layers of p and n type semiconductors. However, unlike BJT the p type body region of a MOSFET does not have an external electrical connection. The gate ... .  Distributed under Creative Commons Attribution-ShareAlike - CC BY-SA. Version 2 EE IIT, Kharagpur

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