双极型运算放大器瞬时电离辐射效应实验研究

Experimental Study of Transient Ionizing Radiation Effects in Bipolar Operational Amplifier

摘要: 建立了运算放大器瞬时电离辐射效应在线测试系统，选取不同带宽、不同压摆率的3种双极型运算放大器，在西北核技术研究所的“强光一号”加速器上进行了实验。结果显示，在相同剂量率下，双极运算放大器的带宽越大、压摆率越高，其输出端口瞬时电离辐射恢复时间越短。分析表明，对于具有内补偿电容的双极运算放大器，其压摆率与补偿电容有关；补偿电容越小，压摆率越大，运算放大器输出端口瞬时电离辐射扰动的恢复时间越短。

Abstract: The in-situ test system of transient ionizing radiation effects for operational amplifier was established to study the response to transient ionizing irradiation. Three different bipolar operational amplifiers with different bandwidths and slew rates were irradiated using the Qiangguang-Ⅰ accelerator in Northwest Institute of Nuclear Technology. The results show that the response time decreases, as the bandwidth and the slew rate of the bipolar operational amplifiers increase for the same dose rate. Analysis indicates that the slew rate is related to the compensation capacitor for the bipolar operational amplifier with inside compensation capacitor. The smaller the compensation capacitor is, the greater the slew rate is.