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二极管型红外探测器数字输出型读出电路

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为实现红外焦平面数字化输出,设计了一款片上集成行列级读出电路,适应于SOI(silicon on insulator)二极管型非制冷红外探测器阵列.读出电路包括一个连续时间增量型二阶sigma-delta调制器和一个输出缓冲器,其中二阶sigma-delta调制器包括跨导模块、跨导运算放大器构成的积分器模块、电流型DAC反馈模块以及比较器.基于此提出的读出电路架构,采用直接数字量化的方式,完全省去了前端模拟放大单元电路.利用连续时间增量型二阶sigma-delta调制器对输入信号驱动要求低的特点,该电路可直接处理SOI二极管型红外探测器输出的相对微弱的电压信号,并输出数字信号.基于SMIC 0.35μm CMOS工艺对电路进行了设计并流片验证,供电电压5 V,读出电路版图通道宽度小于30μm,适应探测器像素尺寸.测试结果表明, 60帧频读出时,读出性能良好,输出噪声9μV,单通道功耗450μW,面积0.092 mm~2.该读出电路相比于普通片上集成行列级读出电路,减小了面积和功耗,简化了整个红外成像系统,适用于低功耗、低噪声、高集成度的大面阵数字化红外传感器成像系统.

A line readout circuit with digital outputs is presented in this paper,which is suitable for SOI diode uncooled infrared focal plane readout channel consists of a second-order sigma-delta modulator and an output modulator includes an integrator,a current DAC,and a h the proposed circuit desiqn which adopts direct digital guantification,traditional analog pre-amplifier circuits are no longer tinuous time increment type sigma-delta modulator can be driven by weak signals,which is capable of dealing with relatively small signals outputted by SOI readout circuit was designed and simulated with 5 V supply voltage and the readout channel width was limited below 30μm to meet the requirement of pixel physical tape-out was completed in SMIC 0.35μm CMOS technology to further validate the effectiveness of this t results show that the output noise was less than 9μV with 60 Frame/s under room temperature,the power consumption of each channel was less than 450μW with 5 V power supply voltage,and the area of each channel was 0.092 mm~pared with traditional readout circuits,the proposed circuit needs no pre-amplifier circuits nor off-chip ADC,which reduces the complexity of the s design can be used in low power,low noise,and high density large scale infrared imaging systems with less chip area and power consumption.