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提出了一种基于有源电阻的电阻反馈跨导放大器(RTIA)红外焦平面读出电路,该电路采用工作在亚阈区的MOS管实现1011Ω以上的有源大电阻,不仅能与热释电红外探测器的高阻抗良好匹配,而且配合两管共源放大器可针对热释电微弱信号进行高增益电流放大。同时,简单的三管单元结构能够方便地置于像元之下,相比于采用特殊高阻材料实现的RTIA,不附加材料和工艺。经上华0.5μmCMOS工艺流片验证,在5 V电源电压下,该电路增益40 dB,输出摆幅3 V,在高低温测试下表现出了良好的增益带宽稳定性,适用于PZT和BST等热释电大阵列探测器。
An active-resistance-based transconductance amplifier (RTIA) infrared focal plane readout circuit is proposed. This circuit uses a MOS transistor operating in the sub-threshold region to achieve an active large resistance of 1011Ω. It can not only be used with pyroelectric The high impedance of the infrared detector is well matched, and with the two-transistor common-source amplifier, the high-gain current can be amplified for the pyroelectric weak signal. At the same time, a simple three-tube cell structure can be conveniently placed under the pixel, with no added materials and processes compared to RTIA using a specially high-resistance material. The Chinese 0.5μmCMOS process flow verified that the circuit gain of 40 dB, the output swing of 3 V at 5 V supply voltage, showing good gain bandwidth stability under high and low temperature test, suitable for PZT and BST Pyroelectric large array detector.