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Encoder | Digital Circuits - Electronics and Communication Engineering (ECE) PDF Download
The combinational circuits that change the binary information into N output lines are known as Encoders. The binary information is passed in the form of 2N input lines. The output lines define the N-bit code for the binary information. In simple words, the Encoder performs the reverse operation of the Decoder. At a time, only one input line is activated for simplicity. The produced N-bit output code is equivalent to the binary information.
There are various types of encoders which are as follows:
4 to 2 line Encoder
In 4 to 2 line encoder, there are total of four inputs, i.e., Y0, Y1, Y2, and Y3, and two outputs, i.e., A0 and A1. In 4-input lines, one input-line is set to true at a time to get the respective binary code in the output side. Below are the block diagram and the truth table of the 4 to 2 line encoder.
Block Diagram
Truth TableThe logical expression of the term A0 and A1 is as follows:
A1 = Y3 + Y2
A0 = Y3 + Y1
Logical circuit of the above expressions is given below:
8 to 3 line Encoder
The 8 to 3 line Encoder is also known as Octal to Binary Encoder. In 8 to 3 line encoder, there is a total of eight inputs, i.e., Y0, Y1, Y2, Y3, Y4, Y5, Y6, and Y7 and three outputs, i.e., A0, A1, and A2. In 8-input lines, one input-line is set to true at a time to get the respective binary code in the output side. Below are the block diagram and the truth table of the 8 to 3 line encoder.
Block Diagram
Truth TableThe logical expression of the term A0, A1, and A2 are as follows:
A2=Y4+Y5+Y6+Y7
A1=Y2+Y3+Y6+Y7
A0=Y7+Y5+Y3+Y1
Logical circuit of the above expressions is given below:
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Decimal to BCD Encoder
The Octal to Binary Encoder is also known as 10 to 4 line Encoder. In 10 to 4 line encoder, there are total of ten inputs, i.e., Y0, Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8, and Y9 and four outputs, i.e., A0, A1, A2, and A3. In 10-input lines, one input-line is set to true at a time to get the respective BCD code in the output side. The block diagram and the truth table of the decimal to BCD encoder are given below.
Block Diagram
Truth Table
The logical expression of the term A0, A1, A2, and A3 is as follows:
A3 = Y9 + Y8
A2 = Y7 + Y6 + Y5 +Y4
A1 = Y7 + Y6 + Y3 +Y2
A0 = Y9 + Y7 +Y5 +Y3 + Y1
Logical circuit of the above expressions is given below:
Priority Encoder
4 to 2 line Priority Encoder:In this priority encoder, there are total of 4 inputs, i.e., Y0, Y1, Y2, and Y3, and two outputs, i.e., A0 and A1. The Y3 has high and Y0 has low priority inputs. When more than one input is '1' at the same time, the output will be the (binary) code corresponding to the higher priority input. Below is the truth table of the 4 to 2 line priority encoder.
Truth Table
The logical expression of the term A0 and A1 can be found using K-map as:
A1 = Y3 + Y2
A0 = Y3 + Y2'.Y1
Logical circuit of the above expressions is given below:
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Uses of Encoders
- These systems are very easy to use in all digital systems.
- Encoders are used to convert a decimal number into the binary number. The objective is to perform a binary operation such as addition, subtraction, multiplication, etc.
The document Encoder | Digital Circuits - Electronics and Communication Engineering (ECE) is a part of the Electronics and Communication Engineering (ECE) Course Digital Circuits.
All you need of Electronics and Communication Engineering (ECE) at this link: Electronics and Communication Engineering (ECE)
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FAQs on Encoder - Digital Circuits - Electronics and Communication Engineering (ECE)
| 1. What is the purpose of the Encoder GATE in machine learning? |  |
| 2. How does the Encoder GATE improve the performance of neural networks? | |
Ans. The Encoder GATE enhances the performance of neural networks by filtering out irrelevant information and reducing dimensionality. This helps in preventing overfitting and allows the model to generalize better on unseen data, ultimately improving accuracy and efficiency.
| 3. What types of data can be processed using the Encoder GATE? | |
Ans. The Encoder GATE can process various types of data, including text, images, and time series. It is versatile and can be applied in different contexts, such as natural language processing, computer vision, and other machine learning tasks.
| 4. Can the Encoder GATE be used in real-time applications? | |
Ans. Yes, the Encoder GATE can be utilized in real-time applications. Its design allows for efficient encoding of input data, making it suitable for scenarios that require immediate processing, such as speech recognition, real-time translation, and automated decision-making systems.
| 5. What are the key components of the Encoder GATE architecture? | |
Ans. The key components of the Encoder GATE architecture typically include input layers, hidden layers, activation functions, and output layers. These elements work together to facilitate the encoding process, ensuring that input data is transformed into a meaningful representation for subsequent analysis.
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