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 Electronics Tutorial

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Electronics Tutorial for Beginners

ABC of Electronics Offering free comprehensive basic electronics tutorial. In this Electronics Tutorial we have explained the basic electronic concepts. Here you can find 8051 Tutorials & 555 Timer Tutorials which are commonly used in electronics. Every effort is made to keep the website up and running smoothly

MOSFET Metal Oxide Semiconductor Field Effect Transistors

igfet

MOSFETS are ordinary Field Effect Transistors. IGFET-insulated-gate field-effect transistor, is  synonymous with MOSFET. The above figure shows these semiconductor devices symbols.

We use MOSFETs for signal amplification  or switching in an electronic circuit.

There are two main families in MOSFET.

Enhancement - where the MOSFET is forward biased like a transistor. We apply positive voltage to drain w.r.t source and also positive to gate region.

Depletion - where the MOSFET is reverse biased. We apply negative voltage to the gate and it will create a small negative charge on the gate. IT REPELS ELECTRONS AND CREATES A DEPLETION region around gate area.

When we make a MOSFET of n type it is called as NMOSFET and when we make MOSFET of p type we call it a PMOSFET.

Below Precautions must be taken when handling them. Soldering iron tips must be grounded to prevent it from damage. The operator must be grounded by using a high value resistor. The workplace must be grounded safely. Components must be handled with care because they are fragile. Some devices have Zener diodes inbuilt, between gate and source to keep it protected.

A normally-off (or enhancement-mode) n-MOSFET has a positive Vt. At Vg = 0 V, the Vg is less positive than Vt and thus no inversion n-channel is present

N-channel enhancement MOSFET.

 
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