Analysis of Switching Activity in Various Implementation of Combinational circuit

Low power technology emerges with increasing transistor count in a miniaturized silicon chip. Power optimization in technology, circuit, layout, logic, architecture and algorithmic levels should be mandatory. Hierarchical level of testing in digital devices to meet the customer requirements will increase device power consumption. Increased test power is the result of built in testing structures embedded in the devices. Test vectors applied during testing suffers from increased transition of vectors from one stable state to another, which causes too much of power loss in digital devices. This paper is proposed to measure the switching activity and dynamic power consumption of the circuits implemented in AOI, NAND and NOR format. Peak and average switching activity and peak dynamic power consumption for the circuits at different implementation during normal and test mode are estimated. The resultant values are compared against each implementation and the best with minimum switching activity and dynamic power is preferred to design a low power circuit.