共基复合管放大电路高频响应的分析和仿真  

The Theory Analysis and Simulation of High Frequency Response of CB Darlington Connection Amplifier Circuit

作　　者：赵鑫[1] 邹峰[1] 陈得宝[1] 方振国[1] 李峥[1] 李素文[1] 杨一军[1] 

机构地区：[1]淮北师范大学物理与电子信息学院,安徽淮北235000

出　　处：《淮北师范大学学报（自然科学版）》2015年第3期26-29,共4页Journal of Huaibei Normal University：Natural Sciences

基　　金：安徽省教育厅专业综合改革试点(2012zy308);安徽省教育厅质量工程:重点教学研究项目(2013jyxm097);重大教学研究项目(2014zdjy060);资源共享课(2012gxk057;2013gxk048);淮北师范大学青年科学研究项目(2014xq005)

摘　　要：借助EWB软件中的受控源模型,构建共基极复合管放大电路的高频简化等效电路,直接启动仿真所获源电压增益、幅频特性、截止频率,与MATLAB编程计算完全一致.探讨源电压增益下降的斜率,结果与单极点渐进波特图吻合,说明复合管中存在主极点、非主极点现象.信号源内阻改变,同时影响源电压增益和截止频率,得到符合主极点表现为单极点,增益带宽积基本不变的结论,为分析各种复合管放大电路的频率响应提供新方法.Based on the controlled source model in EWB, a high frequency simplified equivalent circuit of common base amplifier with Darlington tubes is founded.The voltage gain, amplitude frequency response and cutoff frequency obtained directly by EWB agree with the results of calculations by MATLAB.The descend- ing slope of source voltage gain is discussed, and the result accords with the unipolar gradual Bode plot;fur- thermore, this result also shows there are dominant poles and non-dominant poles in the Darlington tube.The change of source resistance influences both source voltage gain and cutoff frequency, which leads to a conclu- sion that the dominant pole is a single pale and the gain bandwidth product is unchanged od which can be used to analyze the frequency response of amplifier with Darlington tubes .Thus, a new meth- is provided.

关 键 词：频率响应 EWB MATLAB 

分 类 号：TN721[电子电信—电路与系统]