The following example is related to the work covered in WEEK 19.

The question was:-*Try to draw the circuit for an EXCLUSIVE NOR Gate
Circuit. Not the one for EXCLUSIVE OR followed by an inverter please!!!! Hint: work
out the truth table for a two input circuit as we did above, and then implement it
using gates.*

The above circuit is supposed to implement an EXCLUSIVE NOR gate. The TRUTH table shown
below is the starting point for the circuit design.

B A OUTPUT 0 0 1 0 1 0 1 0 0 1 1 1The output is a 1 only when A or B are the same. The two cases for a TRUE output are A = 0 and B = 0; A = 1 and B = 1. This suggests a way of making the circuit, AND A to B for one case. AND NOT A to NOT B for the other case. The two cases are OR'd together to give the required circuit. The TRUTH table shows how circuit operation is calculated in sections. The NOT A and NOT B columns are included to make the calculations easier

B NOT B A NOT A X y x+y = OUTPUT 0 1 0 1 1 0 1 0 1 1 0 0 0 0 1 0 0 1 0 0 0 1 0 1 0 0 1 1The circuit to implement the above looks like this.