红外焦平面阵列读出电路非线性的研究  

Investigation on the Nonlinearity of Infrared Plane Arrays Readout Circuit

作　　者：文勇[1] 夏晓娟[1] 孙伟峰[1] 

机构地区：[1]东南大学国家专用集成电路系统工程技术研究中心,南京210096

出　　处：《半导体光电》2010年第3期455-458,共4页Semiconductor Optoelectronics

摘　　要：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 infrared focal plane array（IRFPA） readout IC （ROIC） design,the non-uniformity is the key limination to its development. Optimizing the nonlinearity of ROIC can improve the non-uniformity and the imaging quality of infrared systems. In this paper,the nonlinearity of CTIA ROIC is analysed,including the nonlinearity of the integral amplifier,sample-and-hold circuit and reset switch. A high-linearity CTIA ROIC is designed based on theoretical analysis. Simulation results obtained with the 0.5 μm DPTM CMOS technology show that the circuit owns low power dissipation,high dynamic range and a high linearity of up to 99.87%.

关 键 词：CTIA 非均匀性 非线性 采样保持电路 动态范围 

分 类 号：TN215[电子电信—物理电子学]