二极管电路的频域分析  

Frequency Domain Analysis of Diode Circuit

作　　者：尹继武[1] 孙彦清[1] 梁锋 龙姝明[1] 卢超[1] 

机构地区：[1]陕西理工学院,陕西汉中723003 [2]陕西省城固师范学校,陕西城固723200

出　　处：《现代电子技术》2007年第16期160-162,共3页Modern Electronics Technique

基　　金：陕西省教育厅科学研究计划资助项目(06JK326)

摘　　要：分别利用二极管伏安特性的折线模型和指数曲线模型,借助Mathematica 5.0软件编写出频谱分析程序,并通过求解超越方程的数值解,对二极管非线性电路进行了深入的频域分析。结果表明,余弦电压经二极管电路后输出信号的频谱分布完全由输入电压的幅值决定,与输入信号频率f无关。输入电压的幅值较小时,除基波f外,输出信号中将会产生2f,3f,4f,5f,…等所有高阶频率成分;但随着输入电压幅值逐渐增大,3f,5f,…等奇次谐波相对幅值快速减小,除基波f外,输出信号中主要包含2f,4f,6f,…等偶次谐波成分。实验观测到的波形和对应频谱图与上述分析结果一致。同时指出了文献中的错误。Using the diode voltage- current characteristic broken line model and the exponential curve model with the aid of Mathematica 5.0 software,and solving the transcendental equationrs numerical solution, the diode nonlinear circuit is analysed in detail in frequency domain. As a result,output signalrs spectra structure is completely decided by the input voltage U. Spectra structure is independent of input signal＇s frequency f. Besides the fundamental wave,output signal as well include all higher harmonic 2f, 3f,4f, 5f, …etc. The relative value of odd harmonic 3f, 5f, …fast reduce with the increasing of input voltage, and Besides the fundamental wave,output signal mainly include even harmonic 2f,4f, 6f, …etc. The experimental observation correspond with above analysis. An error of reference documentation is pointed out and corrected.

关 键 词：二极管 频域 频谱 超越方程 

分 类 号：TN773.2[电子电信—电路与系统] TN711.4