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    Front end systems with switched termination for enhanced intermodulation distortion performance
    9.
    发明授权
    Front end systems with switched termination for enhanced intermodulation distortion performance 有权

    公开(公告)号：US11159194B2

    公开(公告)日：2021-10-26

    申请号：US16949730

    申请日：2020-11-12

    申请人： Skyworks Solutions, Inc.

    发明人： Robert John Thompson ,  Timothy M. Faughn ,  Jonathan Christian Crandall

    IPC分类号： H04B1/44 ,  H04M1/00 ,  H04L5/14

    摘要： Front end systems with switched termination for enhanced intermodulation distortion performance are provided herein. The switched termination can be used on transmit paths and/or receive paths of the front end system to suppress impedance variation when the signal paths are inactive. For example, with respect to switched termination for transmit paths, a front end system can include a frequency multiplexing circuit connected to a band switch by a first radio frequency (RF) signal path and by a second RF signal path. The band switch selectively provides the frequency multiplexing circuit with a first transmit signal over the first RF signal path and with a second transmit signal over the second RF signal path. The front end system further includes a switched termination circuit in shunt with the first RF signal path and operable to turn on to suppress impedance variation when the first RF signal path is inactive.

    Apparatus and methods for envelope tracking systems
    10.
    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.