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    Supply modulator, modulated power supply circuit, and associated control method
    3.
    发明授权
    Supply modulator, modulated power supply circuit, and associated control method 审中-公开

    公开(公告)号：US10673385B2

    公开(公告)日：2020-06-02

    申请号：US16040594

    申请日：2018-07-20

    Applicant: MEDIATEK Inc.

    Inventor： Shih-Mei Lin ,  Che-Hao Meng ,  Da-Wei Sung ,  Chien-Wei Kuan

    IPC: H03F3/217 ,  H03F1/02 ,  H02M3/158 ,  G05F1/565 ,  H02M3/335

    Abstract: A supply modulator, a modulated power supply circuit, and associated control method are provided. The modulated power supply circuit includes the supply modulator and a DC-DC voltage converter, and the supply modulator includes a linear amplifier and a switching converter. The linear amplifier generates an AC component of a modulated voltage according to a regulated voltage and an envelope tracking signal. The supply voltage is converted to the regulated voltage by the DC-DC voltage converter, and the regulated voltage is greater than or less than the supply voltage. The switching converter includes a step-down circuit and a path selection circuit. The path selection circuit selects one of the supply voltage and the regulated voltage as a DC input voltage. The step-down circuit converts the DC input voltage to a DC component of the modulated voltage which is less than the DC input voltage.

    DC-DC CONVERTER AND ASSOCIATED CONTROL METHOD
    5.
    发明申请
    DC-DC CONVERTER AND ASSOCIATED CONTROL METHOD 有权

    公开(公告)号：US20170222556A1

    公开(公告)日：2017-08-03

    申请号：US15201626

    申请日：2016-07-05

    Applicant: MEDIATEK INC.

    Inventor： Shih-Mei Lin ,  Chien-Wei Kuan ,  Chien-Lung Lee ,  Che-Hao Meng

    IPC: H02M3/158 ,  H02M1/08

    CPC classification number: H02M3/158 ,  G05F1/618 ,  H02M1/08 ,  H02M2001/0009 ,  H02M2001/0045 ,  H02M2003/1566

    Abstract: A DC-DC converter includes an inductor, a switch module, a pull-up circuit and a pull-down circuit. The inductor has a first node and a second node, and the second node is coupled to an output node of the DC-DC converter. The switch module is arranged for selectively connecting an input voltage or a ground voltage to the first node of the inductor according to a driving signal. The pull-up circuit is arranged for selectively providing a first current to the output node of the DC-DC converter. The pull-down circuit is arranged for selectively sinking a second current from the output node of the DC-DC converter. In addition, at least one of the first current provided by the pull-up circuit and the second current sunk by the pull-down circuit is determined based on an inductor current flowing through the inductor.

    Power supply with envelope tracking modulation
    6.
    发明授权
    Power supply with envelope tracking modulation 有权

    公开(公告)号：US11088660B2

    公开(公告)日：2021-08-10

    申请号：US16728193

    申请日：2019-12-27

    Applicant: MEDIATEK INC.

    Inventor： Shih-Mei Lin ,  Chien-Wei Kuan ,  Che-Hao Meng ,  Chen-Yen Ho

    IPC: H03F1/30 ,  H03F1/02 ,  H03F3/21

    Abstract: A power supply configured to supply a modulated voltage to a power amplifier is shown. The power supply has an alternating current (AC) component generator, a direct current (DC) component generator, and a transition accelerator. The AC component generator generates an AC component of the modulated voltage according to an envelope tracking signal. The DC component generator generates a DC component of the modulated voltage according to the operational voltage range of the power amplifier. The transition accelerator is coupled to an output terminal of the DC component generator to speed up the transition of the modulated voltage.

    DC-DC converter with pull-up or pull-down current and associated control method
    7.
    发明授权
    DC-DC converter with pull-up or pull-down current and associated control method 有权

    公开(公告)号：US10122258B2

    公开(公告)日：2018-11-06

    申请号：US15826715

    申请日：2017-11-30

    Applicant: MEDIATEK INC.

    Inventor： Shih-Mei Lin ,  Chien-Wei Kuan ,  Chien-Lung Lee ,  Che-Hao Meng

    IPC: H02M3/158 ,  H02M1/14 ,  H02M1/08 ,  H02M1/00 ,  G05F1/618 ,  H02M3/156

    Abstract: A DC-DC converter includes an inductor, a switch module, and a pull-up circuit or a pull-down circuit. The inductor has a first node and a second node, and the second node is coupled to an output node of the DC-DC converter. The switch module is arranged for selectively connecting an input voltage or a ground voltage to the first node of the inductor according to a driving signal. The pull-up circuit is arranged for selectively providing a first current to the output node of the DC-DC converter. The pull-down circuit is arranged for selectively sinking a second current from the output node of the DC-DC converter. In addition, the first current or the second current is determined based on an inductor current flowing through the inductor.

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