基于自偏置电流镜的CMOS红外焦平面读出电路

针对高精度红外焦平面阵列应用设计了一种具有高注入效率、大动态范围、稳定的探测器偏压、小面积和低功耗的自偏置电流镜注入CMOS读出电路.所设计的电路结构包括一种由自偏置的宽摆幅PMOS共源共栅电流镜和NMOS电流镜构成的反馈结构读出单元电路和相关双采样电路.对所设计电路采用Chartered 0.35 μm CMOS工艺进行了流片.测试结果显示:电路线性度达到了99%,探测器两端偏压小于1mV.电路输入阻抗近似为0,单元电路面积为10μm×15μm,功耗小于0.4μW.电量存储能力3108电子.测试结果表明:电路功能和性能都达到了设计要求.

CMOS readout circuit for infrared focal plane array using self-bias current mirror

A high injection effectivity,large dynamic range,stable detector bias,small area and low power consumpfion CMOS readout circuit was proposed.A high-swing self-bias P-type cascodc current milTor and an N-type current mirror to form the feedback structure followed by a correlated double sampling(CDS)circuit were employed in this structure.An experimental chip had been fabricated in Charter 0.35μm CMOS process.Experimental results show that the detector bias error in this structure is less than 1 mV;the input resistance is close to ideal value of zero.Unit-cell occupies 10 μm×15μm area and consumes less than 0.4μW power.Charge storage capacity is 3×108 electrons.The linearity of the designed circuit is almost 99%.And the function and performance of the proposed readout circuit have been verified by experimental results.