Radiation Response of PNP Input Bipolar Operational Amplifiers

Ionizing radiation response of PNP input bipolar operational amplifiers was investigated at different biases and different dose rates. Results show that the change of bias currents at forward bias is greater than that at zero bias for high dose rate. While for low dose rate irradiation, the change of bias currents at forward bias is less than that at zero bias. Two types of PNP input bipolar operational amplifiers exhibit enhanced low dose rate sensitivity (ELDRS) obviously and the ELDRS is more significant at zero bias.