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在红外焦平面阵列读出电路中,非均匀性是限制其发展的主要瓶颈之一。优化读出电路的非线性可以改善焦平面阵列的非均匀性,提高红外系统的成像质量。文章主要对电容跨阻抗放大器(CTIA)型读出电路的非线性进行研究,包括该结构的积分放大器、复位管以及采样保持电路的非线性,并在理论分析的基础上提出了优化单元电路非线性的方法,设计了一个高线性的CTIA型单元电路。具体电路采用0.5μm DPTM CMOS工艺设计,仿真结果表明该单元电路功耗低,动态范围大,线性度高达99.87%。
In the infrared focal plane array readout circuit, non-uniformity is one of the main bottlenecks that limit its development. Optimizing the non-linearity of the readout circuit can improve the non-uniformity of the focal plane array and improve the imaging quality of the infrared system. In this paper, the nonlinearity of the CTIA readout circuit is studied, including the non-linearity of the integrated amplifier, the reset transistor and the sample-and-hold circuit. Based on the theoretical analysis, Linear method, designed a high linear CTIA type unit circuit. The specific circuit is designed with 0.5μm DPTM CMOS technology. The simulation results show that the circuit has low power consumption, large dynamic range and high linearity of 99.87%.