Fault Tolerance Decision in DRAM Applications

SERs are higher than HERs. These errors stem from two sources: alpha particles and cosmic rays. Alpha particle SERs have been virtually eliminated in modern DRAM technology. No DRAM is entirely insensitive to cosmic rays, but IBM DRAMs have very low cosmic ray sensitivity because the IBM “inside-store” trench cell stores more charge. In addition, the inside-store trench stores the charge in a dielectric capacitor, minimizing the charge collection area.