An Approximate Adder Design Based on Inexact Full Adders

Wenqiang Yang, Lunyao Wang, Kailei Li
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引用次数: 1

Abstract

Approximate computing is a design way that sacrifices certain accuracy in exchange for circuit performance. The purpose is to reduce the circuit area, delay and power dissipation. In this paper, an approximate adder design method for Ripple Carry Adder (RCA) is proposed. The method mainly consists of three parts: (1) Building a library of inexact full adders with the parameters of error characteristic and area. (2) Using genetic algorithm to choose different approximate full adders for multi-bits RCAs under error distance constraints. (3) Error distance calculation by disjoint sharp product operation with logic cover. Compared with accurate RCA, the circuit area optimization of multi-bits approximate adder proposed in this paper can reach 36.21% when the mean error distance and normalized error distance are less than 1%.
基于不精确全加法器的近似加法器设计
近似计算是一种牺牲一定精度以换取电路性能的设计方法。目的是减少电路面积、延迟和功耗。提出了一种纹波进位加法器(RCA)的近似加法器设计方法。该方法主要由三部分组成:(1)建立以误差特征和面积为参数的不精确全加法器库。(2)在误差距离约束下,利用遗传算法选择多比特rca的近似全加法器。(3)带逻辑盖的不相交锐积运算误差距离计算。与精确RCA相比,本文提出的多位近似加法器在平均误差距离和归一化误差距离均小于1%的情况下,电路面积优化达到36.21%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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