Multiplexer
| MCS-012 Computer
organisation and assembly Language In the large-scale-digital systems, a single line is required to carry on two or more digital signals – and, of course! At a time, one signal can be placed on the one line. But, what is required is a device that will allow us to select; and, the signal we wish to place on a common line, such a circuit is referred to as multiplexer. The function of a multiplexer is to select the input of any ‘n’ input lines and feed that to one output line. The function of a de-multiplexer is to inverse the function of the multiplexer and the shortcut forms of the multiplexer. The de-multiplexers are mux and demux. Some multiplexers perform both multiplexing and de-multiplexing operations. The main function of the multiplexer is that it combines input signals, allows data compression, and shares a single transmission channel. What is a Multiplexer and De-multiplexer? 1.Multiplexer Multiplexer is a device that has multiple inputs and a single line output. The select lines determine which input is connected to the output, and also to increase the amount of data that can be sent over a network within certain time. It is also called a data selector. The single pole multi-position switch is a simple example of non-electronic circuit of multiplexer, and it is widely used in many electronic circuits. The multiplexer is used to perform high-speed switching and is constructed by electronic components. Multiplexers are capable of handling both analog and digital applications. In analog applications, multiplexers are made up of of relays and transistor switches, whereas in digital applications, the multiplexers are built from standard logic gates. When the multiplexer is used for digital applications, it is called a digital multiplexer. Multiplexer Types 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) The 8-to-1 multiplexer consists of 8 input lines, one output line and 3 selection lines. 8-1 Multiplexer Circuit For the combination of selection input, the data line is connected to the output line. The circuit shown below is an 8*1 multiplexer. The 8-to-1 multiplexer requires 8 AND gates, one OR gate and 3 selection lines. As an input, the combination of selection inputs are giving to the AND gate with the corresponding input data lines. In a similar fashion, all the AND gates are given connection. In this 8*1 multiplexer, for any selection line input, one AND gate gives a value of 1 and the remaining all AND gates give 0. And, finally, by using OR gate, all the AND gates are added; and, this will be equal to the selected value. Applications of Multiplexers Multiplexers are used in various applications wherein multiple-data need to be transmitted by using single line. Communication System A communication system has both a communication network and a transmission system. By using a multiplexer, the efficiency of the communication system can be increased by allowing the transmission of data, such as audio and video data from different channels through single lines or cables. Computer Memory Multiplexers are used in computer memory to maintain a huge amount of memory in the computers, and also to reduce the number of copper lines required to connect the memory to other parts of the computer. Telephone Network In telephone networks, multiple audio signals are integrated on a single line of transmission with the help of a multiplexer. Transmission from the Computer System of a Satellite Multiplexer is used to transmit the data signals from the computer system of a spacecraft or a satellite to the ground system by using a GSM satellite. https://www.elprocus.com/what-is-multiplexer-and-de-multiplexer-types-and-its-applications/ |
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