Historical Computer Engineering - Logical Circuits
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Logical Circuits



Identity

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Introduction

The identity gate has only one input and one output. The value of the output is equal to the input.

Example

During a competition participants can win a price, if they can reach a certain score.

participant reaches the score won the price
True True
False False

Truth Table

A Z
1 1
0 0

Functional Equation

equation of function for identity

Electronic Symbol

electronic symbol of identity

Exercises

verbal propositional calculus:

Claim: Everybody, who works for a company longer than 5 years, will get a Christmas bonus.

Employee Nico works for the company for 3 years, he will get the bonus. ________. false
Employee Dana is a part of the company for longer than 10 years, she will get the bonus. _________. true

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Specials

The identity gate can be built - like all other gates - from NAND gates:
A = (A NAND A) NAND (A NAND A)
the equivalent NAND gate of the identity gate