Measuring method of weak nonlinear current-voltage relationship based on AC excitation

被引：2
作者：
He Y. [1 ,2 ]
Bai C. [1 ]
Wang X. [1 ]
Bai H. [1 ]
Hu T. [1 ]
Cui W. [1 ]
Liu C. [2 ]
机构：
[1] National Key Laboratory of Science and Technology on Space Microwave, China Academy of Space Technology (Xi'an), Xi'an
[2] School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an
来源：
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2016年 / 50卷 / 06期
关键词：
Current-voltage; Harmonics; Nonlinearity; Passive intermodulation;
D O I：
10.7652/xjtuxb201606015
中图分类号：
TM93 [电气测量技术及仪器];
学科分类号：
080802 ;
摘要：
A new method based on AC excitation is proposed to characterize the weak nonlinear current-voltage relationship in huge linear background, which is hardly measured by the DC method in the study of passive intermodulation mechanism of RF and microwave components. The current-voltage relationship of the nonlinear system is firstly analyzed when AC voltage is applied and its expression is derived, then samples consisting of a diode in parallel with different resistors are measured The coefficients for linear and nonlinear parts are calculated from the measured amplitude of harmonics with different order, the current-voltage relationship of samples and the weak nonlinear part of the current-voltage relationship coming from diode are also obtained from the resulting expression. Results show that the proposed method obtains a weak nonlinear part of current which is 3-4 orders smaller than the linear part in magnitude, and exhibits advantage of the method over traditional DC method. Moreover, the calculated weak nonlinear parts of currents coming from the same diode with different samples are almost equal, and the practicability of the method is confirmed. The method will offer a new way for investigating nonlinear conduction mechanism that is resulted in passive intermodulation. © 2016, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.
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页码：97 / 103
页数：6
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