## what is Decoder?

(hello guys! Today I am going to tell you about what is Decoder in this article and its type. So let's start)

**What is Decoder?**

A decoder is a logic circuit that can identify each combination of signals given at its input. It takes 2n output lines when n-input lines are taken.

**For example:**If the input of the decoder has two binary lines then the output of the decoder will have four lines.

In other words, "A decoder is a circuit that converts a code into a group of signals." This is called a decoder because it is the reverse of the encoder.

### Types of Decoder:

Its types are as follows:

#### 2 to 4 decoder:

It consists of two input lines. Four combinations of input signals can be made from two lines - 00, 01, 10, and 11. For each of these combinations, one of the 4 output lines is HIGH and the rest of the lines are at low.

**For example:**If the input is 112 then the output line '3' is on logic '1' and all the remaining lines are on logic '0'. This action is called decoding.

In the above picture you are given the symbol of 2 to 4 decoder. It is also called 1 out of 4 decoder. Because only one of the four output lines is at HIGH.

Its logic circuit is shown in the picture above. Which has 4 control input (A, B, C, D) and 16 output lines.

No data input is given to this decoder, instead they are given input only as control bits (ABCD). In this decoder, for any one combination of inputs, one of the 16 output lines is at 'HIGH' and the remaining lines are at 'LOW'. Therefore this decoder is also called 1 of 16 decoder.

- What are multiplexers and demotiplexers?
- Flip flop coach

#### BCD to decimal decoder:

The BCD to decimal decoder has 4 input lines and 10 output lines. 1 out of 10 decoders also says that only 1 out of 10 output lines is on 'high'. And the remaining lines are 'less'.**For example**: When the value of ABCD is 0100, only output line 4 is 'high'.

#### BCD to 7 segment decoder:

The use of 7 segment LED displays is very high in digital systems. BCD data needs to be replaced. That is why this data is changing from BCD to 7 segments.The circuit of this decoder has 4 input lines. By which BCD in DP castes are. The decoder has 7 output lines with 7 segment displays. And the additional decoder is formatted with the display in 7 sections of the output line.

There is no DIT below the active or active high decoder. 7 segment displays can also be common cathode or common node.

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