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In the circuit shown, A and B are the inputs and F is the output. What is the functionality of the circuit?

In the circuit shown, A and B are the inputs and F is the output. What is the functionality of the circuit? Correct Answer XNOR

Case A:

A = 0, B = 0

NMOS 1 → OFF

NMOS 2 → OFF

PMOS 3 → ON

PMOS 4 → ON

Output = 1

Case B and Case C

A = 0, B = 1 or

A = 1, B = 0

In both cases either of NMOS is ON and one of the PMOS is OFF.

Case D:

A = 1, B = 1

Both NMOS are ON

NMOS will pass logic high from input A and B

F = 1

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Truth table

A

B

Y

0

0

1

0

1

0

1

0

0

1

1

1

 

This is an EXNOR logic.

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