• TITLE: IMPEDANCE FREQUENCY RESPONSE MEASUREMENT WITH MATLAB IMPLEMENTATION
• AUTHOR(S): H. Zhivomirov, I. Iliev
• ABSTRACT: In the present paper a Matlab®-based program is developed for measuring the impedance frequency response of two-port circuits using data acquisition system NI USB-6211, Matlab® Data Acquisition Toolbox and Matlab® Signal Processing Toolbox. A brief theoretical analysis is given including the concept of complex impedance and frequency response, the Maximum Likelihood method for signal amplitude and phase estimation, and a simple method for phase correction due to non-instantaneous sampling in DAQ-system. Block diagrams of the experimental setup and the program algorithm are presented. A comparison and analysis between the theoretical and experimental data has been made and conclusions about the measurements are drawn. The proposed Matlab® program can be downloaded for free, from the link given at the end of the paper. With slight alterations in the program code the latter could be used for frequency response measurements of four-port circuits.
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