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超高增益低噪声红外焦平面读出电路研究

Study on High-gain and Low Noise Infrared Focal Plane Readout Circuit

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摘要

高增益探测对 InGaAs焦平面探测器在微光夜视条件下成像有重要意义。设计了一款 InGaAs焦平面用的高增益低噪声 64×64元读出电路。读出电路输入级采用 CTIA模式(电容负反馈放大),通过计算发现输入级运算放大器热噪声是主要噪声源,采用单端替代差分运放将输入级噪声降低 26%。同时,研究积分电容和增益、满阱容量、噪声的关系,将积分电容降低到 1 fF,实现了超高增益和低噪声探测。读出电路采用 0.18 .m工艺设计,像元中心距为 30 .m。经过 PEX(寄生参数提取)参数提取,实际积分电容为 0.94 fF,经过测试芯片整体功耗低至 24.1 mW,电路噪声电子数为 4.37e。

Abstract

High-gain detection of InGaAs focal plane arrays is important to low light night vision imaging. A high-gain low-noise 64.64 readout circuit has been developed for InGaAs focal plane arrays. CTIA(capacitance trans-impedance amplifier) was chosen as the input stage circuit. The thermal noise of the input stage integral operational amplifier was found to be the dominant source of noise through calculation. By using a single-ended alternative differential operational amplifier, input stage circuit noise could be reduced by 26%. Based on the research of relationship between integration capacitor and full-well capacity, gain and noise, ultra-high gain and low-noise results were achieved by reducing the integration capacitance to 1 fF. The readout circuit has been designed using 0.18 mm process and the pixel pitch was 30 mm. The overall power consumption was 24.1 mW. The circuit noise was 4.37 e when the actual integrated capacitor is 0.94 fF.

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中图分类号:TN402

所属栏目:材料与器件

基金项目:浙江省自然科学基金重点项目( LZ17F010001)“面向生物细胞检测的 CMOS毫米波电阻抗传感芯片的研究”

收稿日期:2018-01-26

修改稿日期:2019-10-13

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景松:杭州电子科技大学研究生院,浙江杭州 310000中国科学院上海技术物理研究所,上海 200083
杨波:中国科学院上海技术物理研究所,上海 200083
黄张成:中国科学院上海技术物理研究所,上海 200083
龚海梅:中国科学院上海技术物理研究所,上海 200083
高海军:杭州电子科技大学研究生院,浙江杭州 310000

联系人作者:高海军(gaohaijun@hdu.edu.cn)

备注:景松(1994-),男,满族,硕士研究生,主要研究方向:短波红外焦平面探测器用读出电路, E-mail:591593501@qq.com。

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引用该论文

JING Song,YANG Bo,HUANG Zhangcheng,GONG Haimei,GAO Haijun. Study on High-gain and Low Noise Infrared Focal Plane Readout Circuit[J]. Infrared Technology, 2019, 41(12): 1117-1123

景松,杨波,黄张成,龚海梅,高海军. 超高增益低噪声红外焦平面读出电路研究[J]. 红外技术, 2019, 41(12): 1117-1123

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