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Ultra low power digital systems are key for any future wireless sensor nodes but also inside nomadic embedded systems (such as inside the digital front end of software defined radios). These systems require the highest possible energy efficiency of logic, which can only be achieved by operating in moderate inversion. Unfortunately, when operating near the threshold voltage, transistors become highly sensitive to process variations, thereby increasing leakage currents and complicating timingdoi:10.1109/dsd.2008.114 dblp:conf/dsd/PaciNCBM08 fatcat:pl5bnopk65fztn5crwv4axtwx4