electronics club
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Electronics Club. Introductory Lecture on Digital Electronics. Why Learn Digital ??. Is it because computers are digital or the world is going Digital ?? As Samsung says “The new realm of DigitAll Technology” One to One functions Virtually immune to noise - PowerPoint PPT PresentationTRANSCRIPT
Electronics ClubIntroductory Lecture on Digital Electronics
Why Learn Digital ?? Is it because computers are digital or
the world is going Digital ?? As Samsung says “The new realm of
DigitAll Technology”
One to One functions Virtually immune to noise Easy to rectify mistakes ( Why?? )
What is Digital Electronics?? A Digital circuit is based on a number of discrete
voltage levels, as distinct from an analog circuit that uses continuous voltages to represent variables directly.
In most cases the number of states is two, and these states are represented by two voltage levels: one near to zero volts and one at a higher level depending on the supply voltage in use.
These 2 discrete states might be called “Low” and “High”, 1 or 0 , True or False.
Simple intuitive Boolean algebra !!!!
Wanna See Noise Immunity !!
Technology
Low Level
High Level
Supply Voltage
CMOS 0 to Vcc/2 Vcc/2 to Vcc
Vcc = 5V
TTL 0 to 0.8V 2V to Vcc Vcc = 5V
What is common to Digital Circuits??
Supply Voltage 5V (at the club ) A term called CLOCK
Will you change Mr. Logical OneMr. Clock
Says :
Yes Sir !!Right away
Mr. Logical OneResponds:
In Electronics Terms A clock is simply a square wave , which
is mostly common to all components put in a digital circuit. We may classify it as a parameter in measuring speed of the circuit.
5V
0V
A Logical One
A Logical Zero
The Binary Number System Representing Nos. as a
sequence of 1’s and 0’s. Nos. in Base 2 Decimal to Binary Conversion Binary to Decimal Conversion Intuitivism here too!!!!
Logic Gates
Simple Boolean functions AND OR NOT XOR NAND NOR
AND Gate
Input 1 Input 2 Output
0 0 0
0 1 0
1 0 0
1 1 1
Input 1(A)
Input 2(B)Output (Y)
Y = A & B
OR Gate
Input 1 Input 2 Output
0 0 0
0 1 1
1 0 1
1 1 1
Y = A | B
Input 1 (A)
Input 2 (B)Output (Y)
NOT Gate
Input Output
1 0
0 1
Y = ~A
Input A Output Y
XOR NOR NAND XNOR Gates
A B A XOR B
0 0 0
0 1 1
1 0 1
1 1 0
A B ~(A&B)
0 0 1
0 1 1
1 0 1
1 1 0
A B ~(A|B)
0 0 1
0 1 0
1 0 0
1 1 0
A B A XNOR B
0 0 1
0 1 0
1 0 0
1 1 1
Dear Transistor Most simple use as a switch
Input
Load Device
Supply
You did not understand something ??? Read the handout Even better come to the
workshop Lets work One to One
Register for the workshop
Finally Be there !!!!
Thank You