Simple wide frequency range impedance meter based on AD5933 integrated circuit

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Abstract

As it contains elements of complete digital impedance meter, the AD5933 integrated circuit is an interesting solution for impedance measurements. However, its use for measurements in a wide range of impedances and frequencies requires an additional digital and analogue circuitry. This paper presents the design and performance of a simple impedance meter based on the AD5933 IC. Apart from the AD5933 IC it consists of a clock generator with a programmable prescaler, a novel DC offset canceller for the excitation signal based on peak detectors and a current to voltage converter with switchable conversion ratios. The authors proposed a simple method for choosing the measurement frequency to minimalize errors resulting from the spectral leakage and distortion caused by a lack of an anti-aliasing filter in the DDS generator. Additionally, a novel method for the AD5933 IC calibration was proposed. It consists in a mathematical compensation of the systematic error occurring in the argument of the value returned from the AD5933 IC as a result. The performance of the whole system is demonstrated in an exemplary measurement. Keywords: impedance, converter, AD5933, SoC, system on a chip, measurement

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Chabowski, K., Piasecki, T., Dzierka, A., & Nitsch, K. (2015). Simple wide frequency range impedance meter based on AD5933 integrated circuit. Metrology and Measurement Systems, 22(1), 13–24. https://doi.org/10.1515/mms-2015-0006

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