Working of E-MOSFET
The working principle of E-MOSFET is that when a positive voltage is applied on the gate terminal, then a conduction channel appears between source and drain terminal.
In n-channel E-MOSFET when the value of gate-to-source voltage is zero, then no drain current flows in a transistor. When the value of gate-to-source voltage is positive then the holes in p-doped region would be repelled by the positive terminal voltage which is applied at gate terminal.
By this a depletion region is created near silicon dioxide layer. But, minority charge carriers of substrate, i.e., electrons would be attracted to the gate terminal near the insulating layer of silicon dioxide. When there is increase in positive voltage from gate-to-source terminal, the gathering of electrons near insulating layer of silicon dioxide increases.
This results in formation of induced n-channel between n-doped region of drain to source terminal. This induced channel connects drain and source terminals internally and current starts flowing through it. The minimum voltage at which current starts flowing through it is called as threshold voltage (VT).
The working of p-channel E-MOSFET is exactly opposite to that of p-channel E-MOSFET, i.e., all voltage polarities are reversed and thus the flow of current is also reversed.
E-MOSFET
Enhancement MOSFET which is commonly called as E-MOSFET is a type of field effect transistor which is used mainly in voltage-controlled devices. It is a unipolar device, i.e. device in which conduction of current takes place either by electrons or holes. It is a three-terminal device which is mainly used as amplifier or in switching devices.
This type of transistor can be used both in analog and digital devices. These transistors are more popular than Bipolar junction transistors due to less power dissipation and negligible leakage current. These are smaller in size and hence find its application in integrated circuits (ICs).
Table of Content
- Enhancement Type MOSFET
- Symbol
- Types of E-MOSFET
- N-Channel E-MOSFET
- P-Channel E-MOSFET
- Working
- Characteristics
- Difference Between Depletion MOSFET and Enhancement MOSFET
- Features of
- Advantages
- Disadvantages
- Applications
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