CMOS circuit hardness to total ionizing dose is improved by a circuit techn
ique that dynamically adjusts well and/or substrate;voltages to maintain co
nstant device threshold voltages. Threshold voltage excursions below a refe
rence value activate an oscillator driving a charge pump. Stabilization is
demonstrated experimentally. Techniques for optimizing the circuitry for va
rious CMOS technology implementations are provided and supported with simul
ations.