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From circuit topology to behavioural model of power amplifier dedicated to radar applications

From circuit topology to behavioural model of power amplifier dedicated to radar applications

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A new behavioural model of a power amplifier (PA) at system level is presented, dedicated to radar applications. This model, which is able to take into account output loading impedance mismatch, is based on a similar topology to the PA's circuit. The model, implemented in Agilent Advanced Design System (ADS), is validated for different loading impedances, until VSWR=2 (voltage standing wave ratio), on the PA's bandwidth. This approach permits an extraction, resulting from simple CW measurements or simulations, and easy model implementation. This work has been supported by DGA (French Defense and Security Agency).

References

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      • Hommel, H., Feldle, H.P.: `Current status of airborne active phased array (AESA) radar system and future trends', 34thEuropean Microwave Conf, 2004, Amsterdam, The Netherlands.
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      • Verspecht, J.: `Scattering functions for nonlinear behavioral modeling in the frequency domain', Fundamentals of Nonlinear Behavioral Modeling: Foundations and Applications Workshop, IEEE MTT-S Int. Microwave Symp., June 2003.
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      • Soury, A., Ngoya, E., Rousset, J.: `Behavioral modeling of RF and microwave circuit blocs for hierarchical simulation of modern transceivers', IEEE MTT-S Int. Microwave Symp., June 2005.
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      • Reveyrand, T.: `A time domain envelope vectorial network analyser for non-linear measurement based modeling accounting impedance mismatches', IMTC 2006, April 2006, Sorrento, Italy.
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