Which of the following gates is known as coincidence detector?

Question

1. AND
2. NAND
3. XOR
4. X-NOR

Comments

then which means anti co incidence detector gate

Answer 1

X-NOR Gate is known as Co-Incidence Detector. Because It's true when both the input is same.

Comments

@valar

Is AND gate also Co-incidence Detector???

because AND gate also returns true when both input are true????

---

haha..  no.. i have corrected my self. thanks.

---

ok........

Answer 2

Coincidence detector, as the name suggests, is something which will detect coincidence in your inputs, i.e, it will give a high output when your inputs coincide with each other. 

Such a property is shown only by X-NOR gate, i.e. it gives a high output if both inputs are either high only or low only.

So, X-NOR is the answer.

P.S - Some books even show AND as the coincidence detector, but it is not as it doesn't show a high input when both inputs are low.