型GaAsInGaAs量子效应光电探测器读出设计.docx

摘要
针对新型GaAs/InGaAs量子效应光电探测器具有的高灵敏度、大动态范围等优点,,针对传统CDS的不足,还设计了可削弱像素串扰的源极跟随CDS电路, n阱CMOS工艺对读出电路进行设计、仿真、版图布局及验证,实现了流片。
×8 探测器阵列测试结果,获得了积分时间、探测器偏压及光照功率等工作条件与响应电压、噪声等关键参数的关系。测试结果表明CTIA读出条件的探测器偏压稳定,%,输出信号摆幅超过2V;而SI读出结构的信噪比较高、芯片面积及功耗更小。通过对读出电路改进方案进行了设计与仿真,证明改进设计可以降低读出噪声,提高动态范围和灵敏度。
通过对微弱交流信号模拟前端接收放大器的测试结果分析,模拟仿真了加入带隙基准源,为放大器提供基准电压及偏置电压,减少外部环境的影响,用仪表放大器消除共模噪声,用带通滤波器进一步削弱噪声。
关键字:GaAs/InGaAs量子效应光电探测器,读出电路,噪声,动态范围,灵敏
度
Abstract
Based on novel GaAs/InGaAs quantum photodetectors have high sensitivity, large dynamic range,,the CTIA·CDS readout structure has been designed, the source follower CDS circuit has designed further,which could avoid the pixel are processed by the n well CMOS technology.
The integration time,detector bias voltage,light power and response voltage, noise and SO on have contrasted between test results of process SI and 5pm CMOS process CTIA readout circuit which are docking with 2×8 detector CTIA readout structure is able to stabilize bias of the detector,shown %linearity and over 2V output signal SI readout structure has higher output signal to noise ratio,smaller chip area and power ,the improved CTIA has design and simulated for improving the dynamic range and
sensitivity.
Based on test results of the weak signal analog front—end receiver amplifier,the bandgap reference to provide reference voltage and bias voltage,the instrumentation amplifier and bandpass filter were added to weaken noise further.
Key words:Photoelectric detector;quantum effect;readout circuit;noise;dynamic
range;sensitivity
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王丞鍪硕士学位论文答辩委员会成员名单
姓名职称单位 备注罗乐 研究员 中科院上海微系统与 主席
信息技术研究所
茅惠兵 教授 华东师范大学
沈建华 副教授 华东师范大学
课题来源:
本课题来源于科技部重大项H(2006CB932802,201 1CB932903)和上海市配套项
目(078014194)。
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第一章绪论弟一早珀T匕

量子效应光电探测器广泛应用于航空遥感,机载探测、跟踪,微光夜视侦察、预警,光雷达跟踪和光电武器制导等领域【l。5】。随着探测器材料和集成电路技术的快速发展,