光电耦合器件g-r噪声模型

A Model for a g-r Noise in Optoelectronic Coupled Devices

在宽范围偏置条件下,测量了光电耦合器件的g-r(产生复合)噪声.实验结果表明,随着偏置电流的增加,g-r噪声逐渐向高频移动,其噪声幅值呈现先增加后减小的变化规律.通过测量前级噪声和后级噪声,发现光电耦合器件g-r噪声来源于后级的光敏三极管.基于载流子数涨落机制,建立了一个光电耦合器件g-r噪声的定量分析模型.实验结果和本文模型符合良好.

g-r noise (generation-recombination noise) in optoelectronic coupled devices(OCDs) is studied in a wide bias range.Experimental results demonstrate that the magnitude of g-r noise becomes large and then shrinks as the input current increases,while its intrinsic frequency gets large.By measuring the front and back noise of OCDs,it is also discussed that the source of g-r noise in OCDs is a photosensitive transistor.Based on the mechanism of carrier number fluctuations,a g-r noise model in OCDs is developed.The experimental results agree well with the developed model.