A way of making an XNOR gate from only NOR gates, using the expression (A+B¯)⋅(A¯+B){\displaystyle (A+{\overline {B}})\cdot ({\overline {A}}+B)}. This construction has a propagation delay 3 times that of a single gate and uses 5 gates. This is worse than an equivalent design using 4 gates
Own work
Inductiveload