中文

Journal of Applied Sciences ›› 2011, Vol. 29 ›› Issue (5): 512-515.doi: 10.3969/j.issn.0255-8297.2011.05.012

• Electronic Engineering • Previous Articles     Next Articles

Simultaneous Measurement of Conductance and Differential Conductance with Operational Amplifier and Fourier Spectrum Analyzer

XIAO Wen-bo1;2, HE Xing-dao1;2, LIU Jiang-tao3   

  1. 1. Key Laboratory of Nondestructive Testing, Ministry of Education, Nanchang Hangkong University,
    Nanchang 330063, China
    2. National Physics Experiment Teaching Center, Nanchang Hangkong University, Nanchang 330063, China
    3. Department of Physics, Nanchang University, Nanchang 330031, China
  • Received:2010-01-08 Revised:2010-09-16 Online:2011-09-28 Published:2011-09-30
  • Supported by:

    国家自然科学基金(No.10904059, No.41066001)； 航空科学基金(No.2010ZB56004)； 江西省教育厅基金(No.GJJ11176)；
    南昌航空大学无损检测技术教育部重点实验室开放基金(No.ZD201029005)； 江西省自然科学基金(No.2009GQW0017,
    No.2009GZW0024)；江西省研究生教育创新基地基金资助

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Abstract:

We propose a method to measure conductance and differential conductance simultaneously using an operational amplifier and Fourier spectrum analyzer. Theoretical analysis is conducted to study the output voltage characteristics of a nonlinear diode under AC and DC bias. Assuming that high-frequency contents are much smaller than low-frequency components in that output voltage, a measurement equation for conductance and differential conductance of the diode is derived. And, an analytical expression of the physical relationship is presented. Simulation and experiments show validity of the method. We also find that the differential conductance signal is an order of magnitude stronger than the conductance signal when the diode is under the same DC bias.

Key words: operational amplifier, Fourier transform, conductance, differential conductance

CLC Number: