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    Apparatus and methods for envelope tracking systems
    1.
    发明授权
    Apparatus and methods for envelope tracking systems 有权

    公开(公告)号：US10333470B2

    公开(公告)日：2019-06-25

    申请号：US15922641

    申请日：2018-03-15

    申请人： SKYWORKS SOLUTIONS, INC.

    发明人： Florinel G. Balteanu ,  Sabah Khesbak ,  Yevgeniy A. Tkachenko ,  David Steven Ripley ,  Robert John Thompson

    IPC分类号： H03F1/02 ,  H03F1/30 ,  H04B1/04 ,  H03F3/21 ,  H03F1/56 ,  H03F3/19 ,  H03F3/24 ,  H03F3/72

    摘要： Apparatus and methods for envelope tracking systems are provided. In certain configurations, an envelope tracking system includes a digital filter that generates a filtered envelope signal based on a digital envelope signal representing an envelope of a radio frequency signal, a buck converter controllable by the filtered envelope signal and including an output electrically connected to a power amplifier supply voltage, a digital-to-analog converter module including an output electrically connected to the output of the buck converter and that provides an output current, and a digital shaping and delay circuit configured to generate a shaped envelope signal based on shaping the filtered envelope signal. The shaped envelope signal controls a magnitude of the output current, and the digital shaping and delay circuit controls a delay of the shaped envelope signal to align the output of the digital-to-analog converter module and the output of the buck converter.