Abstract: In this paper we present high speed 8-bit Carry Skip Adder (CSA) compared with Ripple Carry Adder (RAC) and conventional Carry Skip Adder (CSA). This is more efficient in terms of power consumption, area usage and speed. Instead to make multiplexer logic, the propose architecture made of AND-OR-Inverter (AIO) combination gate for carry skip adder. The propose architecture are evaluated by comparing their speed, power and area with those of other address using 180nm, 90nm and 45nm static CMOS technology.

Keywords: Ripple Carry Adder ( RCA), Carry Skip Adder(CSKA), CI-CSKA, high performance, incrimination.