The analysis of conditions for preservation of gain-frequency and phase-frequency characteristics optimality under analog and digital filters transformation
https://doi.org/10.32362/2500-316X-2020-8-2-43-58
Abstract
Prototype filters have wide usage for the design of filters with required quality indexes (QI) of gain-frequency response (GFR). The designed filter is obtained from a prototype filter b means of frequency transformation, which preserves these QI. But most of employed frequency transformations result in variations of QI of phase-frequency response (PFR). In this paper we proposed to use prototype filters that are Pareto-optimal for QI of GFR and PFR. Transfer functions of these filters may be found by means of heuristic optimization algorithms. This method will be efficient if the frequency transformation preserves the optimality of filters. It was shown that frequency transformation has this feature if it preserves the result of QI comparison (more or less) for filters with equal orders. Compliance of this criterion was checked for bilinear transformation of analog low pass filters (LPF) into digital LPF and for Konstantinidis transformation of digital LPF into other digital LPF. The analysis showed that Pareto-optimality for QI of GFR and PFR is preserved if the delay-frequency characteristic of the filter has a minimum at zero frequency and has a maximum at the upper boundary of the pass band. These conditions are complied for LPF with sufficiently small unevenness of GFR in the pass band and sufficiently fast decline of GFR at higher frequencies. Examples confirming these conclusions are given.
About the Author
A. V. Smirnov
MIREA – Russia Technological University
Russian Federation
Russian Federation
Alexander V. Smirnov, Cand. Sci. (Engineering), Professor of Department of Telecommunications and Radio Techniques, Institute of Radio Engineering and Telecommunication Systems
78, Vernadskogo Pr., Moscow 119454
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1. The analysis showed that the Pareto optimality for gain-frequency response and phase-frequency response is maintained when the delay frequency characteristic of the filter has a minimum at a zero frequency, and a maximum at the upper boundary of the passband. These conditions are met in the case of a low-pass filter with a sufficiently small unevenness of the gain-frequency response in the passband, and a sufficiently rapid decline of the gain-frequency response at higher frequencies. The paper gives examples that confirm these conclusions. | |
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For citations:
Smirnov A.V. The analysis of conditions for preservation of gain-frequency and phase-frequency characteristics optimality under analog and digital filters transformation. Russian Technological Journal. 2020;8(2):43-58. (In Russ.) https://doi.org/10.32362/2500-316X-2020-8-2-43-58
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