Approximate circuits and approximate circuit design methodologies attracted a significant attention of researchers as well as industry in recent years. In order to accelerate the approximate circuit and system design process and to support a fair benchmarking of circuit approximation methods, we propose a library of approximate adders and multipliers called EvoApprox8b. This library contains 473 Pareto optimal 8-bit approximate adders created from 13 conventional adders and 500 Pareto optimal 8-bit approximate multipliers created from 6 conventional multipliers. These implementations were evolved by a multi-objective Cartesian genetic programming. The EvoApprox8b library provides Verilog, Matlab and C models of all approximate circuits. In addition to standard circuit parameters, circuit error is given for seven different error metrics.
If you utilize this 8-bit circuits please refer this paper:
The construction of 12-bit multipliers is detaily described in the paper: