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In this paper, a new error-compensation network for fixed-width multipliers is proposed. The error-compensation block is composed of two summation trees which are optimally chosen in order to minimize either the mean-square error or the maximum absolute error. The new technique substantially improves error performances with respect to previously proposed approaches. Simulation results show that new fixed-width multipliers exhibit significant improvements both in propagation delay and in power dissipation with respect to previous solutions.