直接注入型IRFPA读出电路像素单元的研究

Research on Pixel Circuit of Direct Injection Readout Circuit for IRFPA

摘要:

像素单元电路是读出电路的核心单元电路,其性能直接关系到整个焦平面成像的性能。文章从电路结构设计、注入效率的分析、电荷存储能力的分析、非线性的优化设计对直接注入型像素单元电路进行了研究。通过仿真,主要分析了像素单元电路中器件参数对注入效率的影响,以及积分电容对读出电路的电荷存储能力及非线性的影响。基于研究结果设计的读出电路采用了CSMC 0.5μm工艺进行流片验证,实测结果表明,电路具有较好的特性,芯片已成功应用于国内某研究所致冷型探测器组件中。 更多还原

Abstract:

Pixel circuit is the key cell of readout circuit, so it is quite important to the performance of Infrared-focal-plane-array (IRFPA). In this paper, the direct injection pixel circuit is analyzed in the respects of circuit structure, injection efficiency, charge storage capacity and nonlinearity. The influence of device parameters on the injection efficiency was fully investigated through simulation and the effects of integration capacitor on the charge storage capacity and nonlinearity were analyzed. Based on the research, the readout circuit is designed and implemented on CSMC0.5μm process. Test results show that the readout circuit has good performance and it has been successfully applied in the detector system of a certain institute and the infrared images have been obtained.