Area and power delay product efficient level restored hybrid full adder (LR-HFA)

Full adder circuit is a ubiquitous building block in VLSI systems and application specific integrated circuits. This article presents an area and power delay product (PDP) efficient CMOS based 1 bit full adder which is suitable to perform arithmetic operations. The simulation results obtained for parameter analysis using Cadence tool shows that the proposed adder preserves more than 20.7% power over the conventional CMOS adder. The PDP is reduced by almost 26.8–55.5% and performs 9.8–46.1% faster operation than the existing adders. The proposed design is investigated in terms of variations in supply voltage, load capacitance, process corner and temperature. To evaluate the performance of LR-HFA in real time environment, we embedded it in a 4, 8, 16 bit carry propagation adder. The proposed adder displays improved PDP performance when compared with standard adder circuits.