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Experiment 1 - The 1-bit Identity Comparator

Look at the truth table. The result x=y can only be equal to 1 if the inputs x and y are identical.

x y x=y
0 0 1
0 1 0
1 0 0
1 1 1

Truth table of a 1-bit identity comparator.

Circuit diagram of a 1-bit identity comparator.

Circuit of a 1-bit identity comparator. (Enlarge)

This logical combination certainly sounds familiar to you. It corresponds to the XNOR logic. With a simple basic gate you are able to set up a 1-bit identity comparator.

You build the circuit with only one of the four XNOR gates on the C-MOS IC 4077.

You want to compare two 2-bit numbers...?

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