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What is MOSFET and its working?
MOSFET (metal-oxide semiconductor field-effect transistor, pronounced MAWS-feht ) is a special type of field-effect transistor ( FET ) that works by electronically varying the width of a channel along which charge carriers ( electron s or hole s) flow. The wider the channel, the better the device conducts.
What is MOSFET why it is used?
The MOSFET (Metal Oxide Semiconductor Field Effect Transistor) transistor is a semiconductor device which is widely used for switching and amplifying electronic signals in the electronic devices. The MOSFET is very far the most common transistor and can be used in both analog and digital ckt.
What is the disadvantage of MOSFET?
Following are the disadvantages of MOSFET: ➨In MOSFET, the layer between Gate and Channel is very fragile which is vulnerable to electro-static damage during installation. It requires well designed circuit to avoid the issue.
How is a MOSFET controlled?
Unlike BJT which is ‘current controlled’, the MOSFET is a voltage controlled device. By applying voltage at the gate, it generates an electrical field to control the current flow through the channel between drain and source, and there is no current flow from the gate into the MOSFET.
How is a MOSFET used in a switching circuit?
When using the MOSFET as a switch we can drive the MOSFET to turn “ON” faster or slower , or pass high or low currents . This ability to turn the power MOSFET “ON” and “OFF” allows the device to be used as a very efficient switch with switching speeds much faster than standard bipolar junction transistors.
What is the use of MOSFET in electronic circuits?
MOSFET Used as a Switch.
Does a MOSFET act as current amplifier?
This fact makes MOSFET capable of raising the strength of a weak signal; thus acting as an amplifier. During the positive half-cycle of the signal, the positive voltage on the gate increases and produces the enhancement-mode .This increases the channel conductivity and hence the drain current .
How is a channel formed in MOSFET?
When the control voltage is applied between gate and source terminal, the channel is formed between the source and drain terminal . Therefore, in this type of MOSFET, the application of control voltage enhances the number of charge carrier near the oxide layer due to which channel is created.