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D. Silveira, M. Gadringer, H. Arthaber, G. Magerl:
"RF-Power Amplifier Characteristics Determination using Parallel Cascade Wiener Models and Pseudo-Inverse Techniques";
Vortrag: Asia Pacific Microwave Conference (APMC), Suzhou, China; 04.12.2005 - 07.12.2005; in: "APMC2005 Proceedings", (2005), ISBN: 0-7803-9433-x; S. 204 - 207.

This article presents a black-box modeling approach of a microwave Power Amplifier (PA) and defines the linear and nonlinear operation regions. An in-band quasi-white real-valued noise like signal is used as stimulus for the identification process to excite every possibly source of nonlinearity. A segment of the input-output measurement data is processed to generate an initial Parallel Cascade Wiener Model (PCWM). The first order Volterra kernel is extracted in order to estimate the amplifier`s memory. Then Pseudo-Inverse Techniques are used to find a parsimonious model. This model is cross-validated with the entire measurement data. The presented modeling approach results in a model intended to be numerically robust and having a high identification percentage based on a variance figure of merit. Finally the linear and nonlinear operation regions of the amplifier are defined, as an alternative to the use of AM/AM curves.

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