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
Preview of Higher Physics - Unit 3 - MOSFET

First 139 words of the document:

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 contact and an implant
No positive voltage applied to the gate: the p-type and n-type regions
behave like `back to back' diodes.
+V supplied to the gate = electrons within the substrate are
attracted to the region below the gate (because it is formed by
electrons it is an n-channel)
V applied between the source and drain (+ drain, - source) ­ a
current flows through the channel from the source to the drain

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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.…read more

Page 3

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Metal
Oxide
Semiconductor
Field
Effect
Transistor…read more

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