Page 39 - Computer_Science_F5

Computer Science of one or another type of digital logic
circuit for their operation. In digital
circuits, the input signals can have only
one two values, that is logic 0 (lower
voltage level) and logic 1 (higher voltage
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level). At the most basic level, digital
electronics is based on binary number,
and it works with ‘1’s and ‘0’s to process
the information. The number system
used in digital systems is ‘ON’ and
‘OFF’, which is represented by ‘1’s and
‘0’s. Digital circuits are designed using
various types of digital components,
such as logic gates.
Modern life depends much on the use of
digital devices: hence the application of Concept of the logic circuit
logical gates becomes vital in the design
and manufacturing these devices. An
example in which logic gates are applied
is the design of a logic circuit for the
control system for a car engine, computer
architecture, and communication systems.
Exercise 1.5
1. Design a logic circuit using AND,
OR, and NOT gates to implement
the following Boolean expression:
A⋅(B+ C ). Draw the circuit
diagram and explain each step.
2. Explain how you could use logic
gates to create a simple security
system that turns on an alarm
(output) only when two conditions
are met: the door is open (input A)
and the motion sensor is triggered
(input B). Draw the circuit and
describe how it works.
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Computer Science Form 5.indd 30
3. Use a logic circuit simulator to create
and test a circuit that represents the
following logic function:(C+ B C.
⋅
Provide screenshots of your circuit
design and simulation results, and
discuss any challenges you faced.
4. Use TinkerCad to simulate the
application of logic gates and verify
if the results match the expected
behavior according to the principles
of logic gates.
Logic circuits
A logic circuit combines two or more
logic gates, such as OR, AND, and NOT
gates. Examples of logic circuits include
adders, subtractors, multiplexers, and
demultiplexers. These circuits perform
complex digital operations by processing
binary inputs to produce specific outputs.
Types of a logic circuit
There are two types of logic circuits:
combinational and sequential.
Combinational logic circuits are made
up of logic gates and produce an output
based on the current input, without
any memory. They are commonly
used in CPU components like the
Arithmetic Logic Unit. Sequential logic
circuits, on the other hand, include
both a combinational logic circuit and
memory. They are used for designing
memory components like registers and
memory. However, further details about
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