CTIA型读出电路非线性的研究

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。

Investigation on the nonlinearity of CTIA readout circuit

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.