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    Apparatus and methods for envelope tracking
    3.
    发明授权
    Apparatus and methods for envelope tracking 有权

    公开(公告)号：US11770104B2

    公开(公告)日：2023-09-26

    申请号：US18158042

    申请日：2023-01-23

    Applicant: Skyworks Solutions, Inc.

    Inventor： Florinel G. Balteanu ,  Serge Francois Drogi ,  Sabah Khesbak ,  Shayan Farahvash ,  David Richard Pehlke

    IPC: H03F1/02 ,  H03F3/24 ,  H04B1/40 ,  H04B1/3827

    CPC classification number: H03F1/0216 ,  H03F3/245 ,  H04B1/3827 ,  H04B1/40 ,  H03F2200/105 ,  H03F2200/451

    Abstract: Envelope tracking systems for power amplifiers are provided herein. In certain embodiments, an envelope tracker is provided for a power amplifier that amplifies an RF signal. The envelope tracker includes a multi-level switching circuit having an output that provides an output current that changes in relation to an envelope signal indicating an envelope of the RF signal when the envelope tracker is operating in an envelope tracking mode. The multi-level switching circuit includes a multi-level supply (MLS) modulator that receives multiple regulated voltages of different voltage levels, and an MLS control circuit that controls the selection of the MLS modulator over time based on the envelope signal. When transitioning the MLS modulator from selection of one regulated voltage level to another regulated voltage level, the MLS control circuit provides a soft transition to gradually switch the regulated voltage levels.

    Multi-level envelope tracking systems with adjusted voltage steps
    5.
    发明授权
    Multi-level envelope tracking systems with adjusted voltage steps 有权

    公开(公告)号：US11757414B2

    公开(公告)日：2023-09-12

    申请号：US17456952

    申请日：2021-11-30

    Applicant: Skyworks Solutions, Inc.

    Inventor： Serge Francois Drogi ,  Florinel G. Balteanu

    IPC: H03F1/30 ,  H03F1/02 ,  H03F3/24 ,  H03F3/195

    CPC classification number: H03F1/0227 ,  H03F3/195 ,  H03F3/245 ,  H03F2200/102 ,  H03F2200/171 ,  H03F2200/336 ,  H03F2200/451

    Abstract: Multi-level envelope tracking systems with adjusted voltage steps are provided. In certain embodiments, an envelope tracking system for generating a power amplifier supply voltage for a power amplifier is provided. The envelope tracking system includes a multi-level supply (MLS) DC-to-DC converter that outputs multiple regulated voltages, an MLS modulator that controls selection of the regulated voltages over time based on an envelope signal corresponding to an envelope of a radio frequency (RF) signal amplified by the power amplifier, and a modulator output filter coupled between an output of the MLS modulator and the power amplifier supply voltage. The envelope tracking system further includes a switching point adaptation circuit configured to control the voltage level of the regulated voltages outputted by the MLS DC-to-DC converter based on a power level of the RF signal.

    ENVELOPE TRACKING SYSTEMS FOR POWER AMPLIFIERS
    7.
    发明申请
    ENVELOPE TRACKING SYSTEMS FOR POWER AMPLIFIERS 有权

    公开(公告)号：US20220393657A1

    公开(公告)日：2022-12-08

    申请号：US17816165

    申请日：2022-07-29

    Applicant: Skyworks Solutions, Inc.

    Inventor： Serge Francois Drogi ,  Florinel G. Balteanu ,  David Richard Pehlke

    IPC: H03F3/24 ,  H04W52/52 ,  H04B1/40

    Abstract: Envelope tracking systems for power amplifiers are provided herein. In certain embodiments, an envelope tracker is provided for a power amplifier that amplifies an RF signal. The envelope tracker includes an error amplifier that controls a voltage level of a power amplifier supply voltage of the power amplifier based on amplifying a difference between a reference signal and an envelope signal indicating an envelope of the RF signal. The envelope tracker further includes a multi-level switching circuit that generates an error amplifier supply voltage based on sensing a current of the error amplifier, and uses the error amplifier supply voltage to power the error amplifier.

    FAST ENVELOPE TRACKING SYSTEMS FOR POWER AMPLIFIERS
    8.
    发明申请
    FAST ENVELOPE TRACKING SYSTEMS FOR POWER AMPLIFIERS 有权

    公开(公告)号：US20210234512A1

    公开(公告)日：2021-07-29

    申请号：US17230269

    申请日：2021-04-14

    Applicant: Skyworks Solutions, Inc.

    Inventor： Florinel G. Balteanu ,  Serge Francois Drogi ,  Sabah Khesbak ,  Hardik Bhupendra Modi

    IPC: H03F1/02 ,  H03F3/24 ,  H03F3/189 ,  H03F3/19

    Abstract: Fast envelope tracking systems are provided herein. In certain embodiments, an envelope tracking system for a power amplifier includes a switching regulator and a differential error amplifier configured to operate in combination with one another to generate a power amplifier supply voltage for the power amplifier based on an envelope of a radio frequency (RF) signal amplified by the power amplifier. The envelope tracking system further includes a differential envelope amplifier configured to amplify a differential envelope signal to generate a single-ended envelope signal that changes in relation to the envelope of the RF signal. Additionally, the differential error amplifier generates an output current operable to adjust a voltage level of the power amplifier supply voltage based on comparing the single-ended envelope signal to a reference signal.

    AUTOMATED ENVELOPE TRACKING SYSTEM
    10.
    发明申请
    AUTOMATED ENVELOPE TRACKING SYSTEM 有权

    公开(公告)号：US20210167733A1

    公开(公告)日：2021-06-03

    申请号：US17095581

    申请日：2020-11-11

    Applicant: SKYWORKS SOLUTIONS, INC.

    Inventor： Serge Francois Drogi ,  Florinel G. Balteanu ,  Luigi Panseri ,  Craig Joseph Christmas ,  Paul T. DiCarlo

    IPC: H03F1/02 ,  H03F1/56 ,  H03F3/191 ,  H03F3/217 ,  H03F3/24

    Abstract: Embodiments described herein relate to an envelope tracking system that uses a single-bit digital signal to encode an analog envelope tracking control signal, or envelope tracking signal for brevity. In certain embodiments, the envelope tracking system can estimate or measure the amplitude of the baseband signal. The envelope tracking system can further estimate the amplitude of the envelope of the RF signal. The system can convert the amplitude of the envelope signal to a single-bit digital signal, typically at a higher, oversample rate. The single-bit digital signal can be transmitted in, for example, a low-voltage differential signaling (LVDS) format, from a transceiver to an envelope tracker. An analog-to-digital converter (ADC or A/D) can convert the single-bit digital signal back to an analog envelope signal. Moreover, a driver can increase the power of the A/D output envelope signal to produce an envelope-tracking supply voltage for a power amplifier.

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