| 二极管型非制冷红外探测器的前端电路设计 |
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| 引用本文： | 赵国芬,赵毅强,赵公元,张志恒,郭肇敏. 二极管型非制冷红外探测器的前端电路设计[J]. 红外与激光工程, 2016, 45(1): 104001-0104001(6). DOI: 10.3788/IRLA201645.0104001 |
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| 作者姓名： | 赵国芬 赵毅强 赵公元 张志恒 郭肇敏 |
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| 作者单位： | 1.天津大学 电子信息工程学院 专用集成电路设计中心,天津 300072; |
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| 基金项目： | 国家863计划(2015AA042605) |
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| 摘 要： | 设计了一种二极管型非制冷红外探测器的前端电路,该电路采用Gm-C-OP积分放大器的结构,将探测器输出的微弱电压信号经跨导放大器(OTA)转化为电流信号,再经电容反馈跨阻放大器(CTIA)积分转化为电压信号输出。该OTA采用电流反馈型结构,可以获得比传统OTA更高的线性度和跨导值。输入采用差分结构,可以有效地消除环境温度及制造工艺对探测器输出信号的影响。电路采用0.35 m CMOS工艺进行设计并流片,5 V电源电压供电。Gm-C-OP积分放大器总面积0.012 6 mm2,当输入差分电压为0~5 mV时,测试结果表明:OTA跨导值与仿真结果保持一致,Gm-C-OP积分放大器可实现对动态输入差分信号到输出电压的线性转化,线性度达97%,输出范围大于2 V。
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| 关 键 词： | 跨导放大器 电容反馈跨阻放大器 Gm-C-OP积分放大器 |
| 收稿时间： | 2015-05-05 |
Design of front-end circuit for uncooled diode infrared detector |
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| Affiliation: | 1.ASIC Design Center,School of Electronic and Information Engineering,Tianjin University,Tianjin 300072,China;2.Sea Eagle Optoelectronic Information Technology Co.,Ltd.,Tianjin 300192,China |
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| Abstract: | A front-end circuit for uncooled diode infrared detector, composed of Gm-C-OP integrated amplifier, was designed. The small input voltage steered from diode detector was transferred into current by an operational transconductance amplifier(OTA), and then the current was converted to voltage by a capacitor transimpedance amplifier(CTIA). The OTA used a current feedback loop to achieve higher linearity and transconductance than the traditional one. By adopting differential input structure, Gm-C-OP integrated amplifier can eliminate the effect of ambient temperature and process on the output signal of detectors. The circuit was fabricated in a 0.35 m CMOS process under 5 V supply voltage. The Gm-C-OP integrated amplifier occupies an area of 0.012 6 mm2. The input differential voltage varied from 0 to 5 mV. Testing results show that the transconductance of OTA is in accordance with the simulation results. The Gm-C-OP integrated amplifier can convert the dynamic small input voltage into a proper voltage linearly and the linearity is 97%. The output range exceeds 2 V. |
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