Radiation Hardening of Voltage References Using Chopper Stabilization

A technique for enhancing the precision of voltage references in an ionizing radiation environment is presented. Radiation-induced mismatch is identified as a fundamental source of error in voltage reference topologies, and chopper offset cancellation is used to mitigate the effect. The efficacy of the proposed technique is demonstrated by irradiating test chips fabricated in a commercial 180-nm process.