On Modelling AM/AM and AM/PM Conversions via Volterra Series


  • Andrzej Marek Borys Gdynia Maritime University
  • Wiesław Sieńko Gdynia Maritime University


In this paper, we present the expressions, not published up to now, that describe the AM/AM and AM/PM conversions of communication power amplifiers (PAs) via the Volterra series based nonlinear transfer functions. Furthermore, we present a necessary and sufficient condition of occurrence of the nonzero values of AM/PM conversion in PAs. Moreover, it has been shown that Saleh’s approach and related ones, which foresee nonzero level of AM/PM conversion, are not models without memory. It has been also shown that using a polynomial description of a PA does not lead to a nonzero AM/PM conversion. Moreover, a necessary condition of occurrence of an AM/AM conversion in this kind of modelling is existence of at least one nonzero polynomial coefficient associated with its odd terms of degree greater than one.

Author Biographies

Andrzej Marek Borys, Gdynia Maritime University

Associate Professor, Department of Marine Telecommunications

Wiesław Sieńko, Gdynia Maritime University

Associate Professor, Department of Marine Telecommunications


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Signals, Circuits, Systems