摘要
介绍了一个工作于快照模式的 CMOS焦平面读出电路的低功耗新结构— OESCA (Odd- Even SnapshotCharge Am plifier)结构 .该结构像素电路非常简单 ,仅用三个 NMOS管 ;采用两个低功耗设计的电荷放大器做列读出电路 ,分别用于奇偶行的读出 ,不但可有效消除列线寄生电容的影响 ,而且列读出电路的功耗可降低 15 % ,因此 OESCA新结构特别适于要求低功耗设计的大规模、小像素阵列焦平面读出电路 .采用 OESCA结构和 1.2μm双硅双铝标准 CMOS工艺设计了一个 6 4× 6 4规模焦平面读出电路实验芯片 ,其像素尺寸为 5 0μm× 5 0μm ,读出电路的电荷处理能力达 10 .37p C.详细介绍了该读出电路的体系结构、像素电路、探测器模型和工作时序 ,并给出了精确的
A novel low power CMOS snapshot readout structure called OESCA (Odd Even Snapshot Charge Amplifier) for focal plane array (FPA) is presented.The pixel circuit includes only three NMOS transistors.Using two low power charge amplifiers as column readout circuit (one is for the odd row readout and the other is for the even row),this structure can not only eliminate the influence of column bus parasitic capacitance,but also save 15% power dissipation of the column circuit.Thus,it is very suitable for large format small pixel lower power readout circuit.An experimental 64×64 OESCA chip has been designed with 1 2μm DPDM n well CMOS technology.The charge handling capacity is 10 37pC with the pixel size of 50μm×50μm.The descriptions of the readout circuit structure,pixel circuit,detector model,operation principle and chip layout is given in detail.Both excellent simulation results and experimental results of the fabricated OESCA readout chip are presented.
