Basic logic gates  AND gate:The truth table is given by A.BBA

Logic circuit

OR Gate logic circuit

Truth table of OR Gate OutputBA

NOT Gate(Invertor)

NAND Gate

The Truth table of NAND Gate OutputBA

NOR Gate Logic circuit

The truth table of NOR_gate (A+B)’BA

XOR Gate (Exclusive-OR)

The truth table of Exclusive- XOR Gate OutputBA

XNOR Gate logic circuit

The truth table of XNOR Gate OautputBA

Basic combinational logic circuits  The SOP expressions are implemented with AND gate for each product term.  The OR Gate for summing all the product  terms.  The SOP is called AND_OR logic

The AND-OR Logic (SOP)

Exlusive OR Gate logic circuit

NAND gate as universal logic gate

The truth table for 4-input AND-OR circuit OutputCDABDCBA

NOR Gate as universal logic element