Optimization of substrate doping for back-gate control in SOI T-RAM memory technology

Abstract

This paper presents various considerations for substrate doping optimization in SOI T-RAM technology. Back gate (substrate voltage) control is used in an SOI T-RAM technology for optimizing cell characteristics. However, it is reported for the first time that typical low-doped substrates used in SOI logic technologies can create unusually slow transient effects in T-RAM cell. It is also demonstrated that the optimization of substrate doping resolves this slow transient problem and improves back gate control of SOI T-RAM memory arrays.