CTIA型读出电路非线性的研究  

Investigation on the nonlinearity of CTIA readout circuit

作　　者：文勇[1] 刘思超[1] 金友山[1] 夏晓娟[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,江苏南京210096

出　　处：《激光与红外》2009年第9期978-981,共4页Laser & Infrared

摘　　要：在红外焦平面阵列读出电路中,其非线性的问题越来越受到重视。读出电路的非线性是产生非均匀性的重要因素,它影响着探测器的灵敏度,限制了探测器的使用范围。文中对电容跨阻抗放大器结构(CTIA)读出电路的非线性进行了理论研究,分析了放大器增益和积分电容对单元电路非线性的影响。同时通过分析源随器结构行选电路,提出采用单位增益负反馈的差分放大器来做行选电路,以提高电路的线性度。In infrared focal plane array readout IC design, its nonlinearity has become more and more important. The nonlinearity of ROIC is the key to generate non-uniformity,which affects the sensitivity of the detector and limits the use range of detectors. In this paper,the nonlinearity of ROIC is studied and the impact of non-linear circuit element by the amplifier gain and integral capacitance is analysed. By analyzing the source structure with the row-election circuit, a unity-gain differential amplifier with negative feedback circuit is put forward to improve the circuit linearity.

关 键 词：CTIA 非线性 放大器增益 积分电容 

分 类 号：TN215[电子电信—物理电子学]