DIGITAL ELECTRONICS AND LOGIC GATES. ANALOG SIGNAL:- Analog signal is continuous time varying current or voltage signal.

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Presentation transcript:

DIGITAL ELECTRONICS AND LOGIC GATES

ANALOG SIGNAL:- Analog signal is continuous time varying current or voltage signal

DIGITAL SIGNAL :- ▪ Digital signal is a pulsation wave from having only discrete values or levels of current or voltage represented as 0 (low current or voltage)and 1(high current or voltage).

▪ LOGIC GATES : building block of digital electronics. ▪ BOOLEAN ALGEBRA:- it is a binary or two value logic algebra. it allows only two values.these two values represent either 'true' or 'false' ; 'on' or 'off'; 'high' or low ; 'closed' or 'open' etc. by 1 and 0 respectively.

OR operation In Boolean algebra, the OR operation is represented by addition (+) sign and the Boolean expression for this operation is given by Y=A+B This can be read as “Y equals A OR B ”

And operation In Boolean algebra, the AND operation is represented by dot (.) sign and the Boolean expression for this operation is given by Y=A.B This can be read as “Y equals A AND B ”

Not operation In Boolean algebra, the NOT operation is represented by a bar over the variable and the Boolean expression is given by Y=A’ This can be read as “Y equals A negated ”

LOGICS GATES AND TRUTH TABLE

OR gate ▪ OR gate has two or more input it gives only one output when any one or more input are ON ▪ The relation between the output (Y)and the input (A AND B) is given by the Boolean expression. Y=A+B Input A Input B Output Y=A+B Y A B

AND gate ▪ AND gate has two or more input and one output is available only when all input are available. ▪ The relation between (A AND B) and the output (Y) is given by the Boolean expression. Y=A.B Input A Input B Output Y=A.B Y= AB A B Y

NOT gate (INVERTER) Input A Output Y The NOT gate has only one input and this input is inverted to only one output The relation between input (A) and the output (Y) is given by the Boolean expression. Y=A’ Y = A’ A Y

NAND gate The logic gate in which the output of the AND gate is given to the input of NOT gate is called the NAND gate The Boolean expression for the NAND gate is given by Y=(A.B)’ Input A Input B Output (Y=A.B)’

NOR gate The logic gate in which the output of the OR gate is given to the input of NOT gate is called the NOR gate The Boolean expression for the NAND gate is given by Y=(A+B)’ Input A Input B Output (Y=A+B)’

THANKYOU MADE BY:- LOKESH BAJORIA