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.

Figure 1 The XOR logic element and its analog using discrete elements.. The second variant of the 2XOR element is shown in Figure 2.Transistors Q1 and Q2, as well as resistor R2, serve as the 2AND ...

The reference frequency in this circuit drives the input of an exclusive-OR gate (XOR gate U2) as well as the input to a delay circuit. Consisting of R1, C1, and comparator U1, the delay circuit ...

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 ...