LESSON 04 – LOGIC GATES (XOR & XNOR) & CIRCUIT SIMPLIFICATION

LESSON NOTE 1 – XOR AND XNOR

XOR GATE

• An XOR gate, called an exclusive-or gate, is an “either or” gate. It will result in a 1 (true) only if both inputs are different.
  
  
• The logic diagram for a XOR gate is:

• The logic table for a XOR gate is the following:

A	B	Q
0	0	0
0	1	1
1	0	1
1	1	0

XNOR GATE

• An XNOR gate is the logical equivalent of an XOR gate followed by a NOT gate. It will result in a 1 (true) only when both inputs are the same value.
  
  
• The logic diagram for an XNOR gate is:

• The logic table for a XOR gate is the following:

A	B	Q
0	0	1
0	1	0
1	0	0
1	1	1