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Logical Circuits

• Fundamentals
  • Propositional calculus
  • Semiconductors
  • MOSFETs
  • CMOS
• Circuits
  • Identity
  • NOT
  • AND
  • NAND
  • OR
  • XOR
  • XNOR
• Credits
• Sources

Negation (NOT)

Introduction

The negation gate is equivalent to the identity and has only one input and output. Differences between those two is that the output value will be the opposite value of the input. Because there are only two possible values (true or false), it is easy to determine the opposite one.

Example

If a project is finished until friday, we do not have to perform a meeting on saturday.

project finished	meeting on saturday
no	yes
yes	no

Truth Table

A	Z
1	0
0	1

Functional Equation

Electronic Symbol

Exercises

verbal propositional calculus:

Claim: When it rains, we do not have to go out for jogging.

It rains, so we have to go out for jogging. ________. false
The sun is shining, so we will go jogging. _________. true

Specials

The NOT gate can be built - like all other gates - from NAND gates:
NOT A = (A NAND A)