Circuit technique for threshold voltage stabilization using substrate biasin total dose environments

Radiation tolerance of CMOS circuits to total dose can be improved by adjus ting the p-substrate voltage to keep the n-channel threshold voltage above a minimum value, This paper presents a circuit design, implemented on an IC and on a breadboard, for dynamically adjusting the substrate voltage. Expe rimental results clearly show that devices with threshold voltage stabiliza tion exhibit longer lifetime a's compared to those without the stabilizatio n circuit.