光电二极管低噪声放大电路的设计  

Design of amplifier circuit of low-noise photodiode

作　　者：李汉超[1] 刘士兴[1] 鲁迎春[1] 黄俊杰[1] 

机构地区：[1]合肥工业大学电子科学与应用物理学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2014年第8期950-953,共4页Journal of Hefei University of Technology：Natural Science

基　　金：安徽省高等学校省级自然科学研究重点资助项目(KJ2012Z316);合肥工业大学青年发展基金资助项目(2012HGXJ0066)

摘　　要：文章首先给出了光电二极管的噪声等效模型并具体分析了主要噪声来源,综合3种噪声源用均方根分析法来计算总的噪声输出,提出基于反馈电容和基于复合放大器的2个改进型电路来降低电路的噪声。计算与仿真结果表明基于反馈电容的降噪电路降低了噪声,但信号的带宽也相应降低了,而基于复合放大器的降噪电路降低了噪声且保持信号的带宽几乎不受影响。The equivalent circuit models of the photodiode amplifier are introduced ,and the main noise sources are studied .Then the total output noise is analyzed by root mean square （RMS） analysis based on three kinds of noises .Finally ,two improved circuits based on feedback capacitance and composite amplifier are proposed to reduce the noise of circuit .T he calculation and simulation results show that the circuit based on feedback capacitance effectively reduces the extreme of noise gain and the band-width of the signal decreases at the same time ,and the circuit based on composite amplifier effectively reduces the extreme of noise gain while the bandwidth of the signal is hardly affected .

关 键 词：光电二极管 电流-电压转换器 放大器噪声 噪声分析 PSPICE仿真 

分 类 号：TN722.71[电子电信—电路与系统]