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In this paper, the characteristic variability in gate-all-around (GAA) silicon nanowire MOSFETs (SNWTs) is experimentally studied. Variation sources in SNWTs are extracted for the first time, taking into account the strongly-confined geometry induced quantum effect, quasi-ballistic effects, as well as the parasitic quantum resistance at the interface of 1D channel and 3D wide S/D regions. The measured...