Power comparison of low bitwidth multipliers

Some common and new low bitwidth signed-digit, carry-save and carry-ribble multipliers are compared at point of view of power dissipation at gate level. Results of synthesis and power simulation with an analog simulator are presented. SD multipliers are relatively big, slow and very power-consuming like expected. From the point of view of the synthesized netlist SD multipliers are not suitable as a replacement of CS multipliers. However, routing of SD-trees is simpler than routing of a Wallace-tree because of the 2 to 1 reduction.