XOR gates make nifty oscillators too, from AF to HF. PotatoSemi (yes, potato chip) makes GHz speed 7400 series equivalents. It would be fun to see what logic at such levels could make possible for RF.

An OR gate that’s actually an OR gate, not 4 or 5 NANDs. Saves space, transistors, power budget, and signal propagation time. Or to boil it all down, it saves transistors.

Here we first discuss the XOR logic operation of the half adder with FAM as a fluorescent indicator. As shown in Figure 1, the hybridization of AB-DNA holds the fluorophore and the quencher in ...