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Dual Rail Precharge circuits offer an effective way to address Differential Power Analysis Attacks, provided routing of differential signals is fully balanced. Fat Wire [1] and Backend Duplication [2] methods address this problem. However they do not consider the effect of coupling capacitance on adjacent differential signals. In this paper we propose a new method, Divided Backend Duplication, which is based on Divided Wave Dynamic Differential Logic [3] and Backend Duplication [2], that effectively addresses balanced routing problem of Dual Rail Precharge circuits. Experimental results on an AES test circuit in 130nm technology show improvements in achieving a balanced dual rail design. Further our method can also be successfully applied to FPGAs. Results from an sbox test circuit implementation on a Xilinx FPGA are presented.

Divided Backend Duplication Methodology for Balanced Dual Rail Routing