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Compact four bit carry look-ahead CMOS adder in multi-output DCVS logic

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1 Author(s)
Ruiz, G.A. ; Dept. de Electron. y Computadores, Cantabria Univ., Santander, Spain

A four-bit carry look-ahead (CLA) CMOS adder based on transistor sharing in a multi-output differential cascode voltage switch (MODCVS) logic is presented. This adder uses a new enhanced CLA unit, which enables the generation of all output carries in one single compact gate structure. Simulation results using HSPICE with CMOS 1.0 μm technology designs show that the four-bit adder proposed has 15.7% less transistors, 27.2% less silicon area, ~14% speed improvement, and a 29.1% reduction in average power consumption compared to a standard DCVS implementation

Published in:

Electronics Letters  (Volume:32 ,  Issue: 17 )