.320 ¡Á 256 Infrared Focal Plane Array Readout Circuit Study

The infrared focal plane arrays(IRFPA) technology has been developed in the past thirty years,which consists of detector arrays and CMOS read-out integrated circuit (ROIC).As to the performance of an advanced IRFPA,the detector is not the most important factor,but the ROIC.Anyway,it is important to design an excellent ROIC.Based on analysis of the present status of ROIC,a 320×256 ROIC for IRFPA is designed with CSMC 0.Sum DPTM technology.The ROIC consists of signal processing circuit and digital logic.Several user programmable functions arc actualized by the complex digital logic design.The full custom layout design method is used to complete the ROIC layout design.The main contents of this paper are as follows.(1) In the fast and second chapter,the present status and develop trend of ROIC are introduced,as well as work principles of a variety of dectors.Then,the design method of ROIC for IRPFA is presented.(2) In the third chapter,the work principle of photovoltaic photodiode is analysed and then the equivalent circuit is presented.At last,refer to the requirement of project, the design ideas and methods are confirmed.(3) In the fourth chapter,the signal processing circuit is designed according to the requirement of project.The signal processing circuit consists of integral amplifier, sample-and-hold circuit and drivers.These modules all meet the project requitment.(4) In the fifth chapter,based on the design of complex logic circuit,several user programmable functions are actualized,comprising global reset,random window readout,readout direction selectable,output mode selectable and cell gain selectable.(5) In the sixth chapter,the full custom layout design method is used to complete the layout of the ROIC.The area of the final layout is 11×12mm².Besides,some techniques in layout design are presented,which are adopted in this project.