Digital Electronics Notes for 3rd SEM PDF

What is multiplexer(MUX)? & (2:1 MUX ,4:1 MUX ,8:1 MUX )... What is multiplexer ? Ans:-  It is a combinational digital logic circuit  which consist of many input and gives output through a single common line with the help of select line. If small 'n' is the no of select line and 'N' is the no of data input line/input line.            Hence the MUX  can be named as 2:1 ,4:1 ,8 1 ,16:1........as so on. * MUX is a universal device.                    2:1  MUX nd This MUX  consist of two data input line and one data select line and switches through a single output line. Let us consider 'Io' and 'I1' is the data input line and 'So' the select line. Truth table of 2:1 MUX. Expression of 2:1 MUX. Realisation of 2:1 MUX.                            4:1 MUX This MUX consist of four data input line and two data select line and  switching through a single output line. Let us consider  Io, I1, I2

What is adder ? & Types of adder.. What is adder ? Ans:-   It is a combinational logic circuit used to add two or more than two either serially and parallely .. Q) :-How many  types of adder are there? Ans:-  There are two types of adder. Half adder. Full adder. 1):- What is half adder? Ans:-   It is a type of adder which is responsible to add only two bit at a time. In half adder there are two input terminal and two output terminal  one is sum and another one is carry . Truth table of half adder. Expression of half adder. Realisation of half adder . Waveform of half adder. 2):- What is full adder ? Ans:-  It is a type of adder which is  responsible to add three bit at a time. In full adder there are three input terminal and two output terminal one is sum and another one is carry. Truth table of full adder. Expression of Full adders. Realisation of Full adder. Waveform of Full adder.        

Conversion of all logic gate with the help of NOR gate.... 1):- NOT gate. 2):- OR gate.. 3):- AND gate.. 4):- NAND gate.. 5):- EX-NOR gate.. 6):- EX-OR gate..

Conversation of all logic gate with the help of NAND gete. NOT gate.. AND gate.. OR gate.. NOR gate.. EX-OR gate.. EX-NOR gate..