Question

For a two-input XNOR gate, with the input waveforms as shown below, which output waveform is correct?

(a) d

(b) a

(c) c

(d) b

I got this question by my college professor while I was bunking the class.

My question is based upon Combinational Circuits topic in section Combinational Circuits of Digital Circuits

Answer 1

Right option is (a) d

Best explanation: When both inputs are same then the o/p is high for a XNOR gate.

i.e., A B O/P

0 0 1

0 1 0

1 0 0

1 1 1.

Thus, it will produce 1 when inputs are even number of 1s or all 0s, and produce 0 when input is odd number of 1s.