Test: De-Multiplexers - Electronics and Communication Engineering (ECE) MCQ

Demultiplexer (DEMUX) is used in digital signal processing, for enhancing the input signal. The input and output ratio in a DEMUX is given by;

1 : 2n, where n = 1, 2, 3, and so on.

Ex: 1 : 1, 1 : 2, 1 : 4, 1 : 8, etc.

Therefore, for one data input they have several (N) outputs.

The given logic circuit represents 2 to 4 decoder and 1 to 4 line demultiplexer.

For the decoder, the inputs are A₁ and A₀, and the enable is input E.

For demultiplexer, input E provides the data, while other inputs accept the selected variables.

This can be verified from the table given below:

Multiplexer: Multiplexer is a device that has multiple inputs and single line output.

De-multiplexer: De-multiplexer is a device that has a signal inputs line and multiple line outputs.

The given figure has one input and two outputs. Hence it is De-multiplexer.

Combinational circuit:

• Combinational and sequential circuits are the digital circuits made using logic gates
• Present output depends on the present input only
• No feedback is present
• No memory is present

Encoder: Encoder is used to converter other codes to binary

Demultiplexer (DEMUX) is used in digital signal processing, for enhancing the input signal. The input and output ratio in a DEMUX is given by;

1 : 2ⁿ, where n = 1, 2, 3, and so on.

Ex: 1 : 1, 1 : 2, 1 : 4, 1 : 8, etc.

Therefore, for one data input they have several outputs.

The word demultiplex means “one into many” and distributor. A demultiplexer sends a single input to multiple outputs, depending on the select lines. It is clear from the diagram:

A demultiplexer sends a single input to multiple outputs, depending on the select lines. Demultiplexer converts single input into multiple outputs.

A demultiplexer sends a single input to multiple outputs, depending on the select lines. As the select input changes, the output of the multiplexer varies according to that input.

IC 74154 is used for the implementation of 1-to-16 DEMUX, whose output is inverted input.

The formula for total no. of outputs is given by 2ⁿ, where n is the no. of select lines. In this case n = 3 since 2³ = 8.

A demultiplexer sends a single input to multiple outputs, depending on the select lines. For one input, the demultiplexer gives several outputs. That is why it is called a data distributor.