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    SELECTING BETWEEN BOOSTED SUPPLY AND BATTERY SUPPLY
    1.
    发明申请
    SELECTING BETWEEN BOOSTED SUPPLY AND BATTERY SUPPLY 审中-公开

    公开(公告)号：US20190326858A1

    公开(公告)日：2019-10-24

    申请号：US16457442

    申请日：2019-06-28

    Applicant: QUALCOMM Incorporated

    Inventor： Zhiqing ZHANG ,  Chi Fan YUNG ,  Joseph DUNCAN ,  Jun HUA ,  Song SHI ,  Thomas MARRA

    IPC: H03F1/02 ,  H03F3/213 ,  H03F3/195 ,  H02M3/155

    Abstract: Certain aspects of the present disclosure provide methods and apparatus for generating an envelope tracking power supply voltage. For example, certain aspects of the present disclosure provide an envelope tracking power supply having a linear amplifier having an output coupled to a power supply node of an amplifier, wherein a power supply node of the linear amplifier is coupled to a first voltage supply node. The envelope tracking power supply may also include a switch mode power supply having an output coupled to the power supply node of the amplifier. Certain aspects also include a circuit having a first switch coupled to the first voltage supply node and a second switch coupled to a second voltage supply node, wherein a power supply node of the switch mode power supply is coupled to the first switch and the second switch.

    LEVEL SHIFTER
    2.
    发明申请
    LEVEL SHIFTER 审中-公开

    公开(公告)号：US20180034466A1

    公开(公告)日：2018-02-01

    申请号：US15658910

    申请日：2017-07-25

    Applicant: QUALCOMM Incorporated

    Inventor： Zhiqing ZHANG ,  Brett WALKER ,  Chi Fan YUNG ,  Justin PHILPOTT ,  Joseph DUNCAN

    IPC: H03K19/0185 ,  H03K19/003 ,  H03K19/00

    CPC classification number: H03K19/018521 ,  H03K19/0013 ,  H03K19/00361 ,  H03K19/0175 ,  H03K19/017509 ,  H03K19/018514 ,  H04W88/02

    Abstract: Certain aspects of the present disclosure provide methods and apparatus for level shifting an input signal ranging between certain voltage levels to generate an output signal ranging between other voltage levels with low power, high speed, and immunity to noise. One example level-shifting circuit generally includes a node for receiving an input signal ranging between a first voltage level and a second voltage level, a first circuit path coupled to the node and configured to level shift the input signal to generate an output signal ranging between a third voltage level and a fourth voltage level, a pulse generator coupled to the node and configured to generate a pulse based on a transition in the input signal between the first and second voltage levels, and a second circuit path connected in parallel with the first path and configured to temporarily short the first path based on the generated pulse.

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