Radiation-Hardened Low-Level Offset Operational Amplifiers

Continuous-time auto-zero and ping-pong operational amplifiers dedicated to space applications are proposed. The circuits were implemented in a standard 130 nm CMOS technology. They have been irradiated to evaluate their low-dose-rate radiation sensitivity. Measurement results show that these architectures can provide an input offset voltage lower than 1 µV. Comparisons with commercial low offset amplifiers are made to show the interest of the auto-offset cancellation for space applications.