Table of contents |
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What is Digital Electronics? |
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Components of Digital Electronics |
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Logic Gate |
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Digital electronics is defined as
The branch of electronics that deals with digital data in the form of codes. There are only two codes in digital electronics, and they are 0 and 1. 0 is considered to be low logic while 1 is considered to be high logic.
Digital electronics or the digital circuit comprises various components that perform specific functions. These components are divided into two categories:
The active components are the transistors and diodes while the passive components are the capacitors, resistors, inductors, etc.
Though the digital system has noise-immunity and better storage it does have disadvantages too:
Digital electronics or digital circuits are an integral part of electronic devices and here are the uses of digital circuits:
A digital circuit that allows a signal to pass through it, only when few logical relations are satisfied, is called a logic gate.
Truth Table
A table that shows all possible input and output combinations is called a truth table.
Basic Logic Gates
(i) OR Gate It is a two input and one output logic gate.
Boolean expression Y = A + B (Y equals A OR B)
(ii) AND Gate It is a two input and one output logic gate
Boolean expression Y = A . B (Y equals A AND B)
(iii) NOT Gate It is a one input and one output logic gate.
Combination of Gates
(i) NAND Gate When output of AND gate is applied as input to a NOT gate, then it is called a NAND gate.
Boolean expression Y = A * B (Y equals negated of A AND B)
(ii) NOR Gate When output of OR gate is applied as input to a NOT gate, then it is called a NOR gate.
Boolean expression Y = A + B ( Y equals negated of A OR B)
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