Article

Article title THE FEATURES OF RADIOSIGNAL PHASE MEASUREMENT BY MEANS OF QUADRATURE DEMODULATOR AD8347
Authors A.V. Pomazanov, S.S. Shibaev, D.P. Volik
Section SECTION II. RADIO ENGINEERING, TELECOMMUNICATIONS
Month, Year 09, 2016 @en
Index UDC 621.376
DOI 10.18522/2311-3103-2016-9-93102
Abstract The features of radiosignal phase measuring by means of quadrature demodulator on inte-grated circuit AD8347, fabricated and examined with workers of "Nanophotonics and optoelec-tronics" laboratory of Southern federal university, are considered. Topicality of quadrature de-modulators investigation is explained with wide use of them in different radioengeneering systems and devices. The accuracy of measurement is substantially determined with the choice of optimal way of hardware output data processing, therefore constantly carried out is the search of algo-rithms of phase shift of two quasi harmonical oscillations, providing minimal error at maximal rate. Such the trial has been implemented by the article authors. The algorithm of signals pro-cessing at the output of demodulator is described; it allows minimizing the errors of phase shift measurement in quite wide range. For minimization of errors made is the decision to use both quadrature channels and reduce total error with averaging the results. Besides, realized is the weighted averaging with normalization conditions, i.e. the sum of coefficient at averaged functions does not have to exceed unity. The results of experimental research of phase shift measurer based on quadrature demodulator in frequency range of 800 – 2700 MHz are given. Basic components of mentioned errors are pointed. They depend on nonidentity of frequency characteristics of channels, irregularity of frequency response of the demodulator and processing algorithm error. Phase shift measurement error does not exceed ±5° in the range from 0° to 340°.

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Keywords Radiosignal; phase; quadrature demodulator; measurement; algorithm.
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