E. N'Goya

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Publications (2)0 Total impact

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    Conference Proceeding: Second order extension of power amplifiers behavioral models for accuracy improvements
    G.Z. El Nashef, F. Torrès, S. Mons, T. Reveyrand, T. Monédière, E. N'Goya, R. Quéré
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    ABSTRACT: In the design process of reconfigurable radars, it is required to study the interaction between antennas and the power amplifiers in order to quantify the distortion and predict the performances of power amplifier (PA) on TX-chains. This paper presents an accurate behavioral model for PAs, based on nonlinear scattering functions, which allows taking into account large output loading impedance mismatches, i.e. Voltage Standing Wave Ratio (VSWR) up to four. First application presented is a black box modeling technique limited to Taylor first order expansion dedicated to moderate VSWR (VSWR ≤ 3). Unfortunately, the first order model is not efficient enough, so a second application is presented, showing an accurate model expanded to Taylor second order in the case of large VSWR (VSWR > 3) which allows predicting circuit performances at system level and establishes a mixed simulation tool for a bilateral communication between amplifiers and antennas.
    Microwave Conference (EuMC), 2010 European; 10/2010
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    Conference Proceeding: Power amplifiers modeling technique for reconfigurable antenna array application
    G.Z. El Nashef, F. Torres, S. Mons, T. Reveyrand, E. N'goya, T. Monédière, R. Quéré
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    ABSTRACT: The design of reconfigurable active antennas requires an efficient system simulation in order to analyze the impact of other components on the array pattern, especially the Power Amplifiers (PA) effect. Therefore, the performance prediction of PA on Tx-Rx chains is important. This paper presents a behavioral model of a PA, which is able to take into account the load impedance mismatch with a VSWR (Voltage Standing Wave Ratio) up to 3. The proposed behavioral model, based on non-linear scattering functions, is extracted from simple CW measurements, and then implemented in Agilent Advanced Design System (ADS). Our behavioral model is validated by comparison with measurement results in the case of loading impedance mismatch (VSWR ≤ 3). Another model was validated (expansion of Taylor series to the second order), taking into account large VSWR (VSWR =3.5).
    Integrated Nonlinear Microwave and Millimeter-Wave Circuits (INMMIC), 2010 Workshop on; 05/2010
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