Design of 64-bit low power parallel prefix VLSI adder for high speed arithmetic circuits

The addition of two binary numbers is the basic and most often used arithmetic operation on microprocessors, digital signal processors and data processing application specific integrated circuits. Parallel prefix adder is a general technique for speeding up binary addition. This method implements logic functions which determine whether groups of bits will generate or propagate a carry. The proposed 64-bit adder is designed using four different types prefix cell operators, even-dot cells, odd-dot cells, even-semi-dot cells and odd-semi-dot cells; it offers robust adder solutions typically used for low power and high-performance design application needs. The comparison can be made with various input ranges of Parallel Prefix adders in terms power, number of transistor, number of nodes. Tanner EDA tool was used for simulating the parallel prefix adder designs in the 250nm technologies.