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Digital Principles and System Design - Combinational logic - Important Short Questions Answers: Combinational logic

**1. Define combinational logic**

When logic gates are connected
together to produce a specified output for certain specified combinations of
input variables, with no storage involved, the resulting circuit is called combinational
logic.

**2. Define Half adder and full adder**

The logic circuit that performs
the addition of two bits is a half adder. The circuit that performs the
addition of three bits is a full adder.

**3. Define Decoder?**

A decoder is a multiple - input multiple
output logic circuit that converts coded inputs into coded outputs where the
input and output codes are different.

**4. What is binary decoder?**

A decoder is a combinational
circuit that converts binary information from n input lines to a maximum of 2n
out puts lines.

**5. Define Encoder?**

An encoder has 2n input lines and
n output lines. In encoder the output lines generate the binary code
corresponding to the input value.

**6. What is priority Encoder?**

A priority encoder is an encoder
circuit that includes the priority function. In priority encoder, if 2 or more
inputs are equal to 1 at the same time, the input having the highest priority
will take precedence.

**7. Define multiplexer?**

Multiplexer is a digital switch.
It allows digital information from several sources to be routed onto a single
output line.

**8. What do you mean by comparator?**

A comparator is a special
combinational circuit designed primarily to compare the relative magnitude of
two binary numbers.

**GLOSSARY TERMS **

1.
**Combinational logic**-When
logic gates are connected together to produce a specified output for** **certain
specified combinations of input variables, with no storage involved, the
resulting circuit is called combinational logic.

2.
**Encoder**-An encoder has 2n input
lines and n output lines. In encoder the output lines generate the** **binary
code corresponding to the input value.

3.
**Decoder**- A decoder is a multiple
- input multiple output logic circuit that converts coded inputs** **into
coded outputs where the input and output codes are different.

4.
**Multiplexer**- Multiplexer is a digital
switch. It allows digital information from several sources to** **be routed
onto a single output line.

5.
**Demultiplexer**- It
allows digital information from single input line to be routed onto a several**
**output line sources.

6.
**Hardware description language (HDL)- hardware
description language or HDL **is any** **language from a
class of computer languages and/or programming languages for formal description
of digital logic and electronic circuits.

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Digital Principles and System Design : Combinational logic : Important Short Questions Answers: Combinational logic |

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