CTIA线列型读出电路输出异常问题研究
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Study on output abnormality of CTIA linear readout circuit
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    摘要:

    CTIA电路结构由于其高注入效率和线性度在小信号探测器读出电路设计中广泛应用。然而,采用该结构作为输入级的TDI线列型读出电路,在使用中处理信号足够大时,帧与帧之间输出电平出现高低差异,最大可达2 V。表现在图像则为明暗条纹交替出现,无法正常探测。积分电容越小,该现象越容易出现。并且,通过改善供电、调节偏置电压和参考电压等措施对该现象均无明显改善。本文针对这一现象,通过深入仿真和理论分析,最终实现问题定位,同时提出解决措施,有效地消除该现象。

    Abstract:

    The capacitor feedback trans impedance amplifier (CTIA) structure is widely used in small signal processing readout integrated circuit (ROIC) design due to its high injection efficiency and linearity.However,using this structure as the input stage time delayed integration (TDI) linear readout circuit,when the processing signal is large enough,the output voltage levels are different between neighboring frames,up to 2 V.In the image,the light and dark stripes appear alternately,which cannot be detected normally.The smaller the integrated capacitance,the easier the phenomenon appeared.Moreover,this phenomenon is not significantly improved by improving the capacity of power supply,changing values of bias and reference voltages.In view of this phenomenon,through in depth simulation and theoretical analysis,the problem is finally located,and the solution to effectively eliminate the phenomenon is put forward.

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王静,刘兴新,李冬冰,袁媛. CTIA线列型读出电路输出异常问题研究[J].激光与红外,2022,52(6):914~917
WANG Jing, LIU Xing-xin, LI Dong-bing, YUAN Yuan. Study on output abnormality of CTIA linear readout circuit[J]. LASER & INFRARED,2022,52(6):914~917

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  • 在线发布日期: 2022-06-24