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Tags: Decoder

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Half Adder using Decoder

This is the combination circuit of Half Adder using 2*4 Decoder.

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1 Stars     410 Views
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2-bit Calculator

Simple 2-bit Calculator with a decoder for a 7 segment display.


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4-Bit Decoder


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2x4 Decoder using Basic Gates

Experiment No. 7: Implementation of 2x4 decoder using basic gates.

Done by:

Saranga K. Mahanta

Scholar Id: 18-14-038



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1 Stars     100 Views

Use two 2-to-4 DECODERS (with Enable bits) one INVERTER gate and two AND gates to implement a 3-to-8 DECODER (with Enable bit).


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Use a 3-to-8 DECODER (and an OR gate) to implement the following function: 𝐹 = ∑𝑚(1,2,3,5,7).


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deco 3 function


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1 Stars     120 Views

2:4 Decoder ( Binary Decoder)

For a decoder, If the input is a N bit binary number, then the output will be one the lines of the 2^N output lines.

So, for a 2-bit binary input, there will be 2^2 output lines and only one of the output lines will be active according to the binary combination of the inputs. This type of decoder is known as 2 to 4 decoder.

A

B

 

Q0

Q1

Q2

Q4

0

0

 

1

0

0

0

0

1

 

0

1

0

0

1

0

 

0

0

1

 

1

1

 

0

0

0

1


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8:1 Multiplexer

Consider a 8:1 multiplexer that takes 8 two-bit inputs (T8 to T1), three-bit control signal (S) and has an output (Out). This Type of multiplexer is known as a 8 to 1 multiplexer. The truth table is given below:

S2

S1

S0

OUT

0

0

0

T1

0

0

1

T2

0

1

0

T3

0

1

1

T4

1

0

0

T5

1

0

1

T6

1

1

0

T7

1

1

1

T8


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Decoders

Contains 

  • 3 to 8 Decoder from 2 to 4 Decoder
  • 2 to 4 Decoder with Enable
  • AND 3

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Decoder:-

A decoder is a combinational circuit. It has n input and to a maximum m = 2n outputs. Decoder is identical to a demultiplexer without any data input. It performs operations which are exactly opposite to those of an encoder.

Block diagram:-

Truth table:-



Diagram:-

*formed using simulator.

Encoder:-

Encoder is a combinational circuit which is designed to perform the inverse operation of the decoder. An encoder has n number of input lines and m number of output lines. An encoder produces an m bit binary code corresponding to the digital input number. The encoder accepts an n input digital word and converts it into an m bit another digital word.

Block diagram:-

Truth table:-

Diagram:-


*formed using simulator.




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Ashwani kumar


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demo Decoder


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Encoder/Decoder


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Encoder, Decoder, Convertor, Full Adder using Decoder


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3 X 8 Decoder By Souvik Ghosh


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3x8 Decoder


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Decoder


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SOP Expression #1 using Decoder


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Decoder


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Truth Table 2*4 Decoder