Logically reversible arithmetic circuit using pass-transistor

This paper proposes novel reversible logic circuits, i.e., a reversible ExOR gate and a two-way AND gate. The gates operate in both directions and the input and output are indistinguishable. We design the circuits using dual-line pass-transistor logic. Applying the method to arithmetic circuits, we realize logically reversible arithmetic circuits. Because proposed circuits have no garbage output, the adder and multiplier operate as the subtracter and divider respectively by replacing the input with the output. We confirm the behavior of the circuits by both real experiments and SPICE simulations.