Heaven’s Light is Our Guide
Department of Computer Science & Engineering
Rajshahi University of Engineering & Technology, Bangladesh
Course Code: CSE 2103
Course Title: Digital Logic Design
Presented by,
Prof. Dr. Boshir Ahmed
Md. Zahirul Islam
Digital
Techniques
Technique
• technique of coming up with a solution to a problem
Digital Systems
• transform signals that can be abstracted as discrete
in range and domain
Analog Vs Digital
Figure 1. Analog signals take a continuum of amplitude
values.
Digital signals take a few discrete amplitudes.
Analog Vs Digital
Digital circuits advantages
• Better immunity to noise
• Easier to implement with IC techniques
• More “adaptable” to variable uses
• Design is done at a more abstract level
• Better economic
Analog Circuits advantages
• Require less devices
• Better to deal with low signal amplitudes
• Better to deal with high frequencies
Analog Vs Digital System
• An analog system manipulates physical quantities
represented in analog form.
Quantities can vary over a continuous range
of values.
• A digital system is a combination of devices designed to
manipulate logical information or physical quantities
represented in digital form.
Quantities can take on only discrete values.
Analog Vs Digital System
The cell phone has digital &
analog components, and
uses both types of signals.
Digital Circuits/Logic Circuits
Digital circuits - produce & respond to predefined voltage ranges.
The term logic circuits is used interchangeably.
A digital circuit
responds to an
input’s binary level of
0 or 1—not to its
actual voltage.
Digital Computers
A computer is a system of hardware that performs
arithmetic operations, manipulates data, and makes
decisions.
Performs operations based on instructions in the
form of a program at high speed, and with a high degree of
accuracy.
Digital Computers
Major parts of a computer:
Input unit—Processes instructions and data
into the memory.
Memory unit—Stores data and instructions.
Control unit—Interprets instructions and sends
appropriate signals to other units as instructed.
Arithmetic/logic unit—arithmetic calculations
and logical decisions are performed.
Output unit—presents information from the
memory to the operator or process.
Digital Computers
The control and arithmetic/logic units are often treated
as one and called the central processing unit (CPU).
Design Abstraction Levels
Digital Progress Today and Tomorrow
There are many needs in the world that digital
technology can meet.
You will be able to become one of the pioneers on
these new frontiers of technology.
Thank
You
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