一种高帧频大动态范围像素级数字化读出电路设计  

A Pixel-Level Digital Readout Circuit Design with High Frame Rate and Large Dynamic Range

作　　者：陈奕璇 李敬国[1] CHEN Yi-xuan;LI Jing-guo(North China Research Institute of Electro-Optics,Beijing 100015,China)

机构地区：[1]华北光电技术研究所,北京100015

出　　处：《红外》2024年第6期26-34,共9页Infrared

基　　金：国科学院西部之光项目(中科院人字[2018]6号文件);中国科学院“十三五”科教基础设施建设项目(发改投资[2020]1394号文件);西安石油大学研究生联合培养基地项目(西石大研[2017]43号);西安石油大学创新与实践能力培养项目(YCS22113167)。

摘　　要：与短波和中波器件相比,长波红外探测器具有较大的光电流和暗电流,故需要强大的电荷存储能力。而使用传统的模拟像元读出电路技术会严重受限于电荷存储能力,使得长波探测器的动态范围和信噪比难以提升,从而制约着长波红外成像系统的发展和应用。提出一种像素级数字读出电路技术,通过数字积分克服了传统模拟积分方案电荷存储能力受限的缺陷,实现了探测器的数字信号输出,能够极大提高探测器的动态范围、抗干扰能力和帧频。该技术是提升长波探测器性能的有效途径。基于该技术设计了一款像元间距为30 m的320×256数字读出电路,其输出以低压差分信号(Low Voltage Differential Signal,LVDS)方式传输。仿真结果显示,该电路的最高帧频可达1000 Hz,动态范围大于95 dB。Compared with short wave and medium wave devices,long wave infrared detectors have larger photocurrent and dark current,so they need strong charge storage capacity.However,the use of traditional analog pixel readout circuit technology is severely limited by charge storage ability,which makes it difficult to improve the dynamic range and signal-to-noise ratio of long-wave detector,restricting the development and application of long-wave infrared imaging system.In this paper,a pixel-level digital readout circuit technology is proposed,which overcomes the limitation of charge storage capacity of traditional analog integration scheme.The digital signal output of detector is realized.The dynamic range,anti-interference ability and frame rate of detector improve greatly.This technique is an effective way to improve the performance of long wave detector.Based on this technology,a digital readout circuit with 320×256 array and pixel spacing of 30 m is designed.The output is transmitted by LVDS.The simulation results show that the maximum frame rate of the circuit can reach 1000 Hz,and the dynamic range is greater than 95 dB.

关 键 词：读出电路 像素级 数字化 高帧频 大动态范围 

分 类 号：TN4[电子电信—微电子学与固体电子学]