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    N-way doherty distributed power amplifier with power tracking
    11.
    发明授权
    N-way doherty distributed power amplifier with power tracking 有权

    公开(公告)号：US10298177B2

    公开(公告)日：2019-05-21

    申请号：US14885890

    申请日：2015-10-16

    Applicant: Dali Systems Co. Ltd.

    Inventor： Kyoung Joon Cho ,  Wan Jong Kim ,  Shawn Patrick Stapleton

    IPC: H03F1/02 ,  H03F3/21 ,  H03F3/193 ,  H03F3/68 ,  H03F1/56 ,  H03F3/60

    Abstract: A power amplifier using N-way Doherty structure with adaptive bias supply power tracking for extending the efficiency region over the high peak-to-average power ratio of the multiplexing modulated signals such as wideband code division multiple access and orthogonal frequency division multiplexing is disclosed. In an embodiment, present invention uses a dual-feed distributed structure to an N-way Doherty amplifier to improve the isolation between at least one main amplifier and at least one peaking amplifier and, and also to improve both gain and efficiency performance at high output back-off power. Hybrid couplers can be used at either or both of the input and output. In at least some implementations, circuit space is also conserved due to the integration of amplification, power splitting and combining.

    DIGITAL HYBRID MODE POWER AMPLIFIER SYSTEM
    12.
    发明申请
    DIGITAL HYBRID MODE POWER AMPLIFIER SYSTEM 有权
    数字混合模式功率放大器系统

    公开(公告)号：US20140327481A1

    公开(公告)日：2014-11-06

    申请号：US14271881

    申请日：2014-05-07

    Applicant: DALI SYSTEMS CO., LTD.

    Inventor： Wan Jong Kim ,  Kyoung Joon Cho ,  Shawn Patrick Stapleton ,  Jong Heon Kim ,  Dali Yang

    IPC: H03F1/32 ,  H03F3/20 ,  H03F3/19

    CPC classification number: H03F1/3247 ,  H03F1/3258 ,  H03F3/19 ,  H03F3/20 ,  H03F3/24 ,  H03F2200/129 ,  H03F2200/451 ,  H03F2201/3224 ,  H03F2201/3227 ,  H03F2201/3233

    Abstract: A RF-digital hybrid mode power amplifier system for achieving high efficiency and high linearity in wideband communication systems is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier in the RF domain. The power amplifier characteristics such as variation of linearity and asymmetric distortion of the amplifier output signal are monitored by the narrowband feedback path and controlled by the adaptation algorithm in a digital module. Therefore, the present invention could compensate the nonlinearities as well as memory effects of the power amplifier systems and also improve performances, in terms of power added efficiency, adjacent channel leakage ratio and peak-to-average power ratio. The present disclosure enables a power amplifier system to be field reconfigurable and support multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels. As a result, the digital hybrid mode power amplifier system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems, where baseband I-Q signal information is not readily available.

    Abstract translation: 公开了一种用于在宽带通信系统中实现高效率和高线性度的RF数字混合模式功率放大器系统。 本发明基于对RF域中的功率放大器进行线性化的自适应数字预失真的方法。 诸如放大器输出信号的线性度和不对称失真的功率放大器特性由窄带反馈路径监测并由数字模块中的自适应算法控制。 因此，本发明可以补偿功率放大器系统的非线性和存储器效应，并且在功率附加效率，相邻信道泄漏比和峰均功率比方面也提高了性能。 本公开使得功率放大器系统能够是现场可重新配置的并且支持多调制方案（调制不可知），多载波和多信道。 结果，数字混合模式功率放大器系统特别适用于诸如基站，中继器和室内信号覆盖系统之类的无线传输系统，其中基带I-Q信号信息不容易获得。

    Digital hybrid mode power amplifier system
    16.
    发明授权
    Digital hybrid mode power amplifier system 有权

    公开(公告)号：US09768739B2

    公开(公告)日：2017-09-19

    申请号：US14271881

    申请日：2014-05-07

    Applicant: DALI SYSTEMS CO. LTD.

    Inventor： Wan Jong Kim ,  Kyoung Joon Cho ,  Shawn Patrick Stapleton ,  Jong Heon Kim ,  Dali Yang

    IPC: H04B1/04 ,  H03F1/32 ,  H03F3/24 ,  H03F3/19 ,  H03F3/20

    CPC classification number: H03F1/3247 ,  H03F1/3258 ,  H03F3/19 ,  H03F3/20 ,  H03F3/24 ,  H03F2200/129 ,  H03F2200/451 ,  H03F2201/3224 ,  H03F2201/3227 ,  H03F2201/3233

    Abstract: A RF-digital hybrid mode power amplifier system for achieving high efficiency and high linearity in wideband communication systems is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier in the RF domain. The power amplifier characteristics such as variation of linearity and asymmetric distortion of the amplifier output signal are monitored by the narrowband feedback path and controlled by the adaptation algorithm in a digital module. Therefore, the present invention could compensate the nonlinearities as well as memory effects of the power amplifier systems and also improve performances, in terms of power added efficiency, adjacent channel leakage ratio and peak-to-average power ratio. The present disclosure enables a power amplifier system to be field reconfigurable and support multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels. As a result, the digital hybrid mode power amplifier system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems, where baseband I-Q signal information is not readily available.

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