Vol. 71

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2018-08-07

Broadband Class-J /F-1 Continuum Mode Design Utilizing Harmonic Efficiency Selectivity Circuit

By Gideon Naah, Songbai He, Weimin Shi, Bin Song, Tian Qi, and Shaddrack Yaw Nusenu
Progress In Electromagnetics Research M, Vol. 71, 169-178, 2018
doi:10.2528/PIERM18060207

Abstract

This paper proposes a harmonic efficiency selectivity circuit (HESC) for achieving a broadband Class-J/F-1 continuum mode power amplifier (PA) with enhanced efficiency. Design equations are derived through continuum mode condition analysis and are used in implementing the HESC. The implemented HESC topology is then used in attaining the broadband Class-J/F-1 continuum mode PA. A theoretical parameter termed harmonic-alpha (ρh) acting as a sub-unit structure in HESC is introduced. Considering harmonic losses, ρh possesses a lookup table containing information on the harmonics. ρh operates in unison with the HESC in selecting the suitable harmonics with the best efficiencies. With ρh, the relationship among the HESC, the optimal impedance at the device's drain, and the terminal load impedance is defined for a greater freedom of harmonic impedance solutions space, efficiency improvement, and bandwidth extension, thus, indicating an increased flexibility in the design of broadband continuum mode PAs. This method is validated with a realized PA prototype operating from 1.3 to 2.4 GHz corresponding to a fractional bandwidth of 59.5%. The experimental results under continuous wave signals indicate that 79% peak efficiency, 42.68 dBm peak output power, and 16.96 dB peak gain are recorded. Moreover, at 1.7 GHz, when being tested with modulated signals at an average output power of 34.83 dBm, the lower and higher adjacent channel power ratios (ACPRs) without digital predistortion (DPD) are -34.9 dBc and -33.9 dBc, respectively, and a drain effifficiency (DE) of 45% is recorded. With DPD, -50.8 dBc and -50.3 dBc are respectively obtained at lower and higher ACPRs at an average output power of 34.6 dBm, and a DE of 44% is achieved.

Citation


Gideon Naah, Songbai He, Weimin Shi, Bin Song, Tian Qi, and Shaddrack Yaw Nusenu, "Broadband Class-J /F-1 Continuum Mode Design Utilizing Harmonic Efficiency Selectivity Circuit," Progress In Electromagnetics Research M, Vol. 71, 169-178, 2018.
doi:10.2528/PIERM18060207
http://www.jpier.org/PIERM/pier.php?paper=18060207

References


    1. Cripps, S. C., P. J. Tasker, A. L. Clarke, J. Lees, and J. Benedikt, "On the continuity of high efficiency modes in linear RF power amplifiers," IEEE Microw. Wireless Compon. Lett., Vol. 19, No. 10, 665-667, Oct. 2009.
    doi:10.1109/LMWC.2009.2029754

    2. Mimis, K., K. A. Morris, S. Bensmida, and J. P. McGeehan, "Multichannel and wideband power amplifier design methodology for 4G communication systems based on hybrid class-J operation," IEEE Trans. Microw. Theory Tech., Vol. 60, No. 8, 2562-2570, Aug. 2012.
    doi:10.1109/TMTT.2012.2198489

    3. Li, Q., S. He, W. Shi, Z. Dai, and T. Qi, "Extend the class-B to class-J continuum mode by adding arbitrary harmonic voltage elements," IEEE Microw. Wireless Compon. Lett., Vol. 26, No. 7, 522-524, Jul. 2016.
    doi:10.1109/LMWC.2016.2574824

    4. Bukvic, B. and M. M. Ilic, "Simple design of a class-J amplifier with predetermined efficiency," IEEE Microw. Wireless Compon. Lett., Vol. 26, No. 9, 699-701, Sep. 2016.
    doi:10.1109/LMWC.2016.2597228

    5. Amirpour, R., R. Darraji, F. Ghannouchi, and R. Quay, "Enhancement of the broadband efficiency of a class-J power amplifier with varactor-based dynamic load modulation," IEEE Microw. Wireless Compon. Lett., Vol. 27, No. 2, 180-182, Feb. 2017.
    doi:10.1109/LMWC.2016.2646905

    6. Dong, Y., L. Mao, and S. Xie, "Fully integrated class-J power amplifier in standard CMOS technology," IEEE Microw. Wireless Compon. Lett., Vol. 27, No. 1, 64-66, Jan. 2017.
    doi:10.1109/LMWC.2016.2630920

    7. Cripps, S. C., RF Power Amplifiers for Wireless Communications, 2nd Ed., Artech House, Norwood, MA, 2006.

    8. Shi, W., S. He, Q. Li, T. Qi, and Q. A. Liu, "Design of broadband power amplifiers based on resistive-reactive series of continuous modes," IEEE Microw. Wireless Compon. Lett., Vol. 26, No. 7, 519-521, Jul. 2016.
    doi:10.1109/LMWC.2016.2574823

    9. Wright, P., J. Lees, J. Benedikt, P. J. Tasker, and S. C. Cripps, "A methodology for realizing high efficiency class-J in a linear broadband PA," IEEE Trans. Microw. Theory Techn., Vol. 57, No. 12, 3196-3204, Dec. 2009.
    doi:10.1109/TMTT.2009.2033295

    10. Aggrawal, E., K. Rawat, and P. Roblin, "Investigating continuous class-F power amplifier using nonlinear embedding model," IEEE Microw. Wireless Compon. Lett., Vol. 27, No. 6, 593-595, Jun. 2017.
    doi:10.1109/LMWC.2017.2701316

    11. Carrubba, V., et al., "Exploring the design space for broadband PAs using the novel continuous inverse class-F mode," Proc. 41st Eur. Microw. Conf. (EuMC), 333-336, IEEE, Oct. 2011.

    12. Carrubba, V., et al., "A novel highly efficient broadband continuous class-F RFPA delivering 74% average efficiency for an octave bandwidth," IEEE MTT-S Int. Microw. Symp. Dig., 1-4, IEEE, Jun. 2011.