New XOR/XNOR and full adder circuits for low voltage, low power applications

Abstract

In this paper, the new low voltage operation exclusive-OR and exclusive-NOR circuits are proposed and a new full adder circuit has been developed. Since the dynamic power dissipation in CMOS is proportional to V dd 2 low voltage operation of the circuit is an important issue. The main design objectives for these new circuits are low power dissipation and full voltage swing at a low supply voltage V dd = 2V). Several XOR circuits have been fully simulated using HSPICE with a 0.4 μm CMOS technology at a low supply voltage. The proposed XOR and XNOR circuits are compared with previously known circuits and shown to provide superior performance. The low voltage full adder circuit has been implemented using the new XOR, XNOR and MUX circuits. The simulation shows that the new low voltage full adder has less power dissipation and a smaller power-delay product than previous full adder circuits.