Synthesis method of procedure for odd-order I/Q demodulation based on replacing multistage with equivalent single-stage demodulation schemes

Vadym I. Slyusar; Pavlo Serdiuk

doi:10.3103/S0735272720050064

Authors

Vadym I. Slyusar Central Research Institute of Armaments and Military Equipment of the Armed Forces of Ukraine, Ukraine https://orcid.org/0000-0002-2912-3149
Pavlo Serdiuk Heroes of Kruty Military Institute of Telecommunications and Information Technologies, Ukraine https://orcid.org/0000-0002-5497-456X

DOI:

https://doi.org/10.3103/S0735272720050064

Keywords:

I/Q demodulator, amplitude-frequency characteristic, AFC, analog-to-digital converter, ADC, quadrature components

Abstract

A method of synthesis of odd-order I/Q demodulators based on replacing the multistage demodulation schemes with equivalent single-stage ones is proposed. The calculation of coefficients of single-stage odd-order I/Q demodulator, which is equivalent to multistage scheme in terms of the waveform of its amplitude-frequency characteristic (AFC), is based on the sample-wise analysis of the process of forming the response of the demodulator output stage that involves the sampling the harmonic signal voltages at the output of analog-to-digital converter (ADC). An example of synthesis of 11-sample former of quadrature components is considered for illustrating the application peculiarities of the method proposed for synthesis of odd-order I/Q demodulators. The comparative results of its AFC calculations are presented. The analytical description of the response of the specified unit in terms of the coefficients of even-order I/Q demodulators forming the multistage scheme has been derived. A number of regularities intrinsic to coefficients of odd-order I/Q demodulators was established, including the regularities characterizing the dependence of their dynamic range on values of weighting coefficients of the initial multistage scheme.

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