Effects of charge confinement and angular strikes in 40 nm dual- and triple-well bulk CMOS SRAMs

Heavy-ion induced upsets are compared in dual-well and triple-well 40 nm CMOS SRAMs. Charge confinement in triple-well structures triggers the single-event upset reversal mechanism for high LET particles. Due to upset reversal, high LET ion-hits incident at off-normal angles show a decrease in SER compared to normally-incident ions for triple-well SRAM cells.