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Minimum energy per operation is typically achieved in the subthreshold region where low speed and low robustness are two challenging problems. This paper studies the impact of Back Biasing (BB) schemes on these features for FDSOI technology. We show that Forward BB can help cover a wider design space in term of optimal frequency of operation while keeping minimum energy. Asymmetric BB between NMOS and PMOS can mitigate the effect of systematic mismatch on Minimum Energy Point (MEP) and robustness. With optimal asymmetric BB, we achieve either a MEP reduction up to 18% or a 36× speedup at the MEP.Index Terms-CMOS FDSOI, 28nm, subthreshold logic, ultralow power, ultra-low-voltage, back gate biasing, robustness, die yield.