电子倍增CCD中电荷载流子倍增寄存器的分布式等效电路模型  

Distributed equivalent circuit model for the charge carrier multiplier of electron multiplying CCDs

作　　者：周蓓蓓[1] 陈钱[1] 何伟基[1] 

机构地区：[1]南京理工大学电子工程与光电技术学院,江苏南京210094

出　　处：《红外与激光工程》2011年第2期229-234,共6页Infrared and Laser Engineering

基　　金：国家部委科研项目(A2620060242;4040508011);江苏省自然科学基金资助项目(BK2008049)

摘　　要：为了研究电子倍增电荷耦合器件(EMCCD)中电荷载流子倍增寄存器(CCM)内部电荷的倍增及转移特性,提出了一种适用于CCM的电荷传输机制仿真的分布式等效电路模型。利用泊松方程求解了均匀掺杂条件下CCM单元的电势分布,通过基尔霍夫电压定律(KVL)得到了该单元的最大电势表达式,从而得到了其分布式等效电路。同时,结合该单元内的电势分布求解,最终得到了分布式等效电路模型。通过对该模型的分析表明:CCM单元内电极间的间隙越小,电荷倍增率越大。CCM电荷传输主要受到自感生电场和热扩散电场作用,由于自感生电场的电荷迁移率作用,大部分电荷在时钟周期的初始阶段完成转移。In order to study the characteristics of the charge multiplication and charge transfer in the charge carrier multiplier （CCM） of the electron multiplying charge-coupled device （EMCCD）, a distributed equivalent circuit model was proposed for the charge delivery in CCM. The potential distribution in the CCM element of uniform doping was carded out by solving the Possion equation. The maximum potential expression in the CCM element was obtained by the Kirchhoff＇s voltage law （KVL）, and the distributed equivalent circuit of the CCM element was shown. Combined with the potential distribution in the CCM element, the distributed equivalent circuit model of the CCM was also gained. The analysis of this model shows that if the interelectrode gap length in the CCM elements decreases, the rate of the charge multiplication increases. The charge delivery mainly depends on the self-induced field and the thermal diffusion field. Most of the stored charges transfer to the next CCM element in the beginning of the clock cycle due to the electron mobility generated by the self-induced field.

关 键 词：电荷载流子倍增寄存器 电子倍增电荷耦合器件 电荷传输 等效电路 

分 类 号：TN223[电子电信—物理电子学]