Radix-4 Adder with Variable Accuracy and Dynamic Output Modification

Abstract

Approximate computing is an appropriate mechanism to lowering computational expenses. They require a necessity between computing precision and the consumption of power, lag elements, and the circuit. However, the approximate requirements for different applications may vary. By some terms, precise results are needed. As a result, this work offers an ACRA, which leverages the gating technique of power to dynamically turn high or low the partial logic gates of an adder element to calculate accurate or approximation results. When the ACRA is set to approximate mode, the partial sum of one adder element is changed to lessen the error distance between the approximate and accurate results. When compared to adjustable adders, the ACRA obtained the optimum necessary between power-lag product and computational accuracy. Furthermore, figure processing result done in this work, the ACRA's PSNR was reduced to 1 dB and its index value was greater than 0.99. The outperform of previous accuracy-configurable adders.