DIGELEC1 Flashcards
branch of electronics that deals with digital format of data and codes.
digital electronics
digital stand for
digit
digital electronics basically has two conditions which are possible
0 (Low Logic)
1 (High Logic)
“1” as true and “0”as false are called
bit
Group of bits are called
byte
Digital electronic circuits are usually made from large assemblies of
logic gates
used to convert the digital information in your computer to analog signals for your device and convert analog signals to digital information for your computer.
modem
This year the use of electronic diodes, and while these where better but they were unreliable.
1940
In this year the prototypes of the computer were constructed from mechanical switches (vacuum tubes) and relays. These were comparatively slow, large, produced a great deal of heat
1930
The next stage was the result of the development in ____ of the transistor which was much smaller, faster and cooler. Simple transisors were replaced by intergrated circuits and that got smaller and smaller and finally depos silicon to be put into a chip.
1947
What type of wave does an analog have
continuous
What type of wave does a digital have
discrete
Can be process, store and transmit data more efficiently but can only assign separate values to each point
digital systems
Most Natural quantities (such as temperature, pressure, light intensity,…) are
Analog quantities
The branch of mathematics involving digital logic is named
boolean algebra
The building blocks used to create digital circuits are
logic gates
3 basic logic gates
AND, OR, NOT
the method of converting a decimal number to a binary number is called
coding
is a method for the description of every decimal digit with respect to its binary code.
BCD
Types of Binary or Digital Codes
- Numeric weighted code
- Special binary codes or non-weighted code
used for security purposes so that in case the message has been detected, it may not be deciphered or decoded
Codes
How many code groups are in the BCD system
10 (0-9)
IC is produced using VLSI by two technologies.
- Application Specified integrated circuit
- Field Programmable Gate Array
expression of every decimal digit (0-9) by means of a 4 – bits binary code
BCD
represents the binary weights of these four bits
Code 8421
The position of the 0 or 1 in a binary number indicates its value within the number.
Value/weight
Formula for determining the largest value that can be represented by a given number of places in base 2
Highest number = 2^n - 1
Decimal to Any
Division
Any to Decimal
Multiplication
these are the set of values used to represent different quantities
Number system
4 types of number system
- Binary
- Decimal
- Octal
- Hexa
Commonly known as decimal number system
base 10
Commonly known as binary number system
base 2
is the process of taking data and representing it with
discreet bits of information
digital encoding
How many bits does an octal have
3
He suggested the base 8 and coined the term octal
James Anderson
Arithmetic operation of AND & OR
Multiplication, Addition respectively
isolates conventional gates from other circuitry.
buffer
what is the third state of a buffer called
high-impedance
Exclusive OR is only true when
both inputs are different
Exclusive NOR is only true when
both inputs are same
