PhysicsChapter 9: Electronics
Logic Gates
Introduction
A logic gate is an electronic circuit that receives one or more digital inputs and produces a digital output according to a particular logical rule. Digital signals are commonly represented by: 0 → LOW 1 → HIGH Three basic logic gates are AND, OR and NOT. Logic gates form the basic building blocks of digital electronic systems.
Definition
AND Gate
An AND gate gives output 1 only when all required inputs are 1. | A | B | Output | | - | - | ------ | | 0 | 0 | 0 | | 0 | 1 | 0 | | 1 | 0 | 0 | | 1 | 1 | 1 |
OR Gate
An OR gate gives output 1 when at least one input is 1. | A | B | Output | | - | - | ------ | | 0 | 0 | 0 | | 0 | 1 | 1 | | 1 | 0 | 1 | | 1 | 1 | 1 |
NOT Gate
A NOT gate has one input and produces the opposite output. | Input | Output | | ----- | ------ | | 0 | 1 | | 1 | 0 |
Exam preparation
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Review the key facts, formulas and checks before you move on.Logic Gates
Sticky Notes · Quick Revision
AND
- 11 → 1
OR
- Any 1 → 1
NOT
- 0 ↔ 1
60-second revision
- AND → all conditions true.
- OR → at least one true.
- NOT → reverses input.
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