Patent ID: 6486525
Filing Date: 2002-11-26
Classification: H01L

Abstract:
An integrated circuit having improved soft error protection comprising:a substrate; a first region of said substrate having a first conductivity type; a pair of transistors having one of a common source or drain, each transistor of said pair of transistors also having the other of a source or a drain, said pair of transistors disposed in a first portion of said first region; a second region below said first region having a second conductivity type different from said first conductivity type; and a trench filled with an electrically non-conductive material sufficient to substantially eliminate soft errors due to electron hole pairs caused by ionizing radiation emanating external to said trench disposed in and extending entirely through said first region and at least to said second region and entirely surrounding said pair of transistors within said first region to isolate said pair of transistors from other portions of said first region external to said first portion.