Linearization of multichannel amplifiers with the injection of second harmonics into the amplifier and predistortion circuit

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Budimir, Djuradj ; Males-Ilic, Natasa ; Milovanovic, Bratislav ; Tomic, Milan

A linearization technique that uses the injection of the fundamental signal second harmonics together with the fundamental signals at the amplifier input has been extended in this paper by introducing the injection the second harmonics into nonlinear microwave amplifier and so-called predistortion circuit. Predistortion circuit produces the third-order intermodulation signals that are injected at the amplifier input together with the second harmonics making the linearization procedure more independent on the phase variation of the second harmonics. In addition, a considerably better improvement is attained for the power of fundamental signals close to 1-dB compression point by applying the linearization technique proposed in this paper in comparison to the linearization with the injection of the second harmonics merely in the nonlinear amplifier.
  • References (6)

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    [2] N. Males-llic, B. Milovanovic, Dj. Budimir, "Amplifiers with improved IMD performance for multi-channel wireless systems", Proc. h i r . Corq! European Microwave Cor$ercnce, September 2002, Milan, Italy.

    [3] N. Males-Ilic, B . Milovanovic, Dj. Budimir, "A multicarrier amplifier design linearized trough second harmonics and second-order IM feedback", Facra Ui~iversiratis. Serier: Elcdronics and Energetics, 2001, Vol. 14, pp.243-252.

    [4] Dj. Budimir, N. Males-llic, B . Milovanovic, "A New Low lntermodulation Amplifier Using Simultaneous Injection and Feedforwarding of Second Harmonics', Proc. h l . Conf Medirerranean Microwave Corferencc. 3un 2002, Caceres, Spain.

    151 N. Males-llic, B. Milovanovic, Dj. Budimir, "Diminished Sensitivity to Phase Variation i n Injected Second Harmonic Linearization Technique for Multychannel Amplifiers", PI.OC.of Inr. Conf Asia Pacific Microwave Cmfer-etice,Novcinber 2002, Kiottn, Japan.

    [ 6 ] N. Males-llic, B. Milovanovic, Dj. Budimjr, "Improvement in "Second Harmonics'' Linearization Technique for Multichannel Amplifiers", Microwave and Optical Technology Lener-s, Vo1.38. No.2, July2003,pp.15O-I53.

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