具有自定义开窗功能的读出电路数字模块研究

Research on digital module of ROIC with customwindowing function

自定义开窗通过重构图像分辨率从而提高读出帧频,是大规模红外焦平面应用中实现感兴趣区域观察及特殊区域检测的重要技术。基于半定制设计流程,本文提出了一种具有自定义开窗功能的读出电路数字模块,该模块在五个外部输入信号的控制下,实现积分时间调控、工作模式切换、任意开窗、防溢出的功能,具有易于扩展、控制简单、操作灵活的优点。针对传统译码电路产生的竞争冒险现象,提出行级脉宽可调选通信号设计及列级多端口读出的解决方案,进一步提高了电路的可靠性。仿真结果表明,整个设计能够正常实现自定义开窗功能,适用于大规模红外焦平面阵列。

The custom windowing is an important technique for the observation of areas of interest and the detection of special areas in large scale infrared focal plane applications by reconstructing image resolution to improve the readout frame rate.Based on the semi custom design flow,a readout integrated circuit(ROIC)digital module with custom windowing function is proposedin this paper,which can realize the functions of integral time regulation,working mode switching,random windowing and anti overflow under the control of five external input signals,and has the advantages of easy expansion,simple control and flexible operation.Aiming at the risk of race and hazard in the traditional decoding circuit,the design of row level pulse width adjustable selection signal and the solution of column level multi port readout are proposedto further improve the reliability of the circuit.The simulation results show that the whole design can properly implement the function of custom windowing normally,and is suitable for large scale infrared focal plane array.