What is a Multiplexor?

A multiplexer is a device that can receive multiple input signals and synthesize a single output signal in a recoverable manner for each input signal. A multiplexer is a comprehensive system that usually contains a certain number of data inputs and has a single output.

A multiplexer is a device that can receive multiple input signals and synthesize a single output signal in a recoverable manner for each input signal. A multiplexer is a comprehensive system that usually contains a certain number of data inputs and has a single output.

Chinese name

Multiplexer

Foreign name

Multiplexer

Nature

Integrated system

Meaning

To make full use of the capacity of the communication channel

Assembly language

(B & S) | (A & (~ S))

1. Multiplexer 1. Meaning

In electronics, a multiplexer (multiplexer or mux) can select a signal from multiple analog or digital input signals and forward it, and output different selected signals to the same output line.

Reuse technology may follow one of the following principles, such as: TDM, FDM, CDM, or WDM. Multiplexing technology is also applied to software operations, such as transmitting multi-threaded information streams to devices or programs at the same time.

2. Multiplexer 2. Meaning

The purpose of using a multiplexer is to make full use of the capacity of the communication channel and greatly reduce the cost of the system. For example, for a pair of telephone lines, its communication frequency band is generally above 100kHz, and the frequency band of each telephone signal is generally limited below 4kHz. At this time, the capacity of the channel is much larger than the amount of information transmitted by a telephone.

Using a multiplexer enables multiple channels of data information to share one channel. When the data stream on the multiplexed line is continuous, this sharing method can achieve good results. Obviously, this is more economical than using a communication line for each terminal. Multiplexers are always used in pairs. One continuous terminal, the other near the host, its role is to separate the received composite data stream according to the channel and send them to the corresponding output line, so it is called a demultiplexer.

3. Multiplexer 3. Principle

The multiplexer is a data selector, which is used to multiplex the data of N input channels to one output channel. The multiplexer has a very important application in digital systems. The implementation structure of 4 to 1 multiplexers is shown in the figure:

There are four channels of data C0 to C3 in the picture. One channel of data is selected from the four channels of data through the selection control signals S2 and S1 (address code) and sent to the output terminal z.

The truth table of the data selector is shown in the table: