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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0.35μm 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 m V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2V。
A diode-based uncooled infrared detector front-end circuit is designed. The circuit uses the Gm-C-OP integrated amplifier structure, the weak voltage signal output by the detector is converted into a current signal by a transconductance amplifier (OTA) Capacitor feedback transimpedance amplifier (CTIA) integral into a voltage signal output. The OTA uses a current-feedback architecture that achieves higher linearity and transconductance than traditional OTAs. Input differential structure, can effectively eliminate the ambient temperature and manufacturing process on the detector output signal. 0.35μm CMOS process circuit design and flow sheet, 5 V power supply voltage. The total area of the Gm-C-OP integrator amplifier is 0.012 6 mm2. When the input differential voltage is 0-5 mV, the test results show that the OTA transconductance value is consistent with the simulation results, and the Gm-C-OP integrator amplifier can achieve dynamic Input differential signal to the output voltage linear conversion, linearity of 97%, the output range is greater than 2V.