Higher Physics - Unit 3 - MOSFET

I created my own revision notes for all units of the Higher Physics course.

These are revision notes for part of the 3rd unit (Radiation and Matter), section 3 (Optoelectronics and Semi-conductors). I've uploaded all the subsections of this section in different files as they are otherwise too large.

MOSFET covers:
• Parts of a MOSFET transistor
• How a MOSFET works (in detail)
• MOSFET threshold
• Switching a MOSFET on
• MOSFET and current
• MOSFET as an amplifier

(This is an n-channel enhancement mode MOSFET)

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  • Created by: Visser
  • Created on: 08-05-10 16:53

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Page 1

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METAL OXIDE SEMICONDUCTOR FIELD EFFECT TRANSISTOR
P-type substrate
Two implants of n-type material
Layer of insulating oxide over substrate/implants
Oxide layer removed over implants
Metal contacts attached to implants
Metal contact added in between the implants
Metal contact added to the opposite side
A connection is made between the opposite…

Page 2

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IS THE GATE VOLTAGE


IS THE DRAIN VOLTAGE



threshold voltage (minimum voltage) = 2V


= MOSFET WILL NOT conduct


= MOSFET WILL conduct




the MOSFET is switched on. A current now
flows from the source to the drain.

There are two ways to increase the drain current:


Increase (beyond the…

Page 3

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n-channel

enhancement

mode


Metal




Oxide




Semiconductor




Field




Effect




Transistor







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