A new direct design for three-input xor function on the transistor level

Instead of cascading two two-input XOR gates, we design a new structure of three-input function on the transistor level in this paper. The basic structure of the proposed three-input XOR function utilizes the least number of transistors and no complementary input signals are needed. From the realistic-simulated results, it proves the basic structure works very well. Under the consideration of driving capacity, we can simply attach a standard buffer to the basic structure for this purpose. The experiments verify that our driving-enhanced three-input XOR gate has more driving capacity and use less power consumption as well as power-delay product than the past cascaded designs using the same number of transistors. The simulation work is done by HSPICE on a SUN SPARC10 workstation.