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Define Decoder,Encoder ,Multiplexer, Demultiplexer

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Decoder :

A binary code of n bits is capable of representing up to 2n distinct elements of coded information. The name “Decoder” means to translate or decode coded information from one format into another, so a digital decoder transforms a set of digital input signals into an equivalent decimal code at its output. A decoder is a combinational circuit that converts binary information from n input lines to a maximum of 2n unique output lines.

Encoder :

An encoder is a combinational circuit that converts binary information in the form of a 2n input lines into n output lines, which represent N bit code for the input. For simple encoders, it is assumed that only one input line is active at a time.

Multiplexer :

A multiplexer is a circuit that accept many input but give only one output. Multiplexer means many into one. A multiplexer is a circuit used to select and route any one of the several input signals to a signal output.
Multiplexers are classified into four types:
  • 2-1 multiplexer ( 1select line)
  • 4-1 multiplexer (2 select lines)
  • 8-1 multiplexer(3 select lines)
  • 16-1 multiplexer (4 select lines)

Demultiplexer :

Demultiplexer means one to many. A demultiplexer is a circuit with one input and many output. By applying control signal, we can steer any input to the output.
Few types of demultiplexer are :
  • 1-2 de multiplexer
  • 1-4 de multiplexer
  • 1-8 de multiplexer
  • 1-16 de multiplexer



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