Analysis of anomalous TDE data on-board the KITSAT-1

The peculiar behavior observed in the TDE (Total Dose Experiment) on board the KITSAT-1 is identified as the thermal effect due to the change in the e clipse rate of the satellite. Similar behavior is seen in the laboratory ex periment as the temperature of the RADFET, the TDE sensor, is varied from 2 0 degrees C to 80 degrees C while it is being irradiated with Co-60 gamma-r ay source. Present study focuses on the modeling effort of separating the r adiation and thermal effects from the complicated data in which these two e ffects are simultaneously present. We derive the device parameters from the non-thermal irradiation data, cmd then include thermal annealing and conve rsion of oxide charges to estimate the oxide trap and interface state charg es in the case of thermal variation. The model fits the experimental data q uite successfully, which will enable us to estimate the pure radiation effe ct on the TDE experienced in space.