摘要
室温工作的中波红外碲镉汞探测器因阻抗低、背景电流大,导致信号读出时信噪比和动态范围受限,影响其室温应用效果。针对该问题,文章设计一种光频转换电路结构。该电路利用低失调运放稳定探测器工作状态,再对探测器的光电流进行电流-电压-电流-频率的转换,将较大的光电流压缩至符合电流频率输入级的范围(0~4.3μA),同时该电路也能有效抑制探测器暗电流和背景电流。测试结果表明,电路在与探测器结合后动态范围可达93 dB,电路功耗仅为27.3 mW,实现了中波红外碲镉汞探测器的室温大动态范围信号读出。
Mid-wave infrared(MWIR)HgCdTe detectors operating at room temperature face challenges in enhancing signal-to-noise ratio(SNR)and dynamic range during signal readout owing to their low impedance and high background currents,which limit their practical applicability under noncooled conditions.This paper presents a light-to-frequency converter circuit architecture designed to address these limitations.The proposed circuit stabilizes the detector’s operating state using a lowoffset operational amplifier and employs a current-to-voltage-to-current-to-frequency conversion process to reduce the high photocurrent into a range suitable for the current–frequency input stage(0 to 4.3μA).Additionally,the circuit effectively suppresses dark and background currents originating from the detector.Experimental results demonstrate that the integrated system achieves a dynamic range of 93 dB with a power consumption of only 27.3 mW,enabling room-temperature,largedynamic-range readout for MWIR HgCdTe detectors.
作者
余双洋
马丁
李向阳
YU Shuangyang;MA Ding;LI Xiangyang(School of Microelectronics,Shanghai University,Shanghai 201800,CHN;Shanghai Institute of Technical Physics Chinese Academy of Sciences,Shanghai 200083,CHN)
出处
《半导体光电》
北大核心
2025年第3期438-443,共6页
Semiconductor Optoelectronics
基金
国家重点研发计划项目(2023YFF0721800)。
关键词
碲镉汞探测器
室温
读出电路
光频转换
大动态范围
HgCdTe detector
room temperature
readout circuit
light-to-frequency converter
large dynamic range
