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    TRANSMITTER, COMMUNICATION UNIT AND METHOD FOR REDUCING HARMONIC DISTORTION IN A TRAINING MODE
    1.
    发明申请
    TRANSMITTER, COMMUNICATION UNIT AND METHOD FOR REDUCING HARMONIC DISTORTION IN A TRAINING MODE 审中-公开

    公开(公告)号：US20190058497A1

    公开(公告)日：2019-02-21

    申请号：US16022937

    申请日：2018-06-29

    Applicant: MediaTek, Inc.

    Inventor： Toru Matsuura ,  Ankush Goel ,  Keng Leong Fong

    IPC: H04B1/04 ,  H04L25/02

    Abstract: A communication unit having a transmitter and method of harmonic distortion content reduction is described. The transmitter is configured to operate in a training mode of operation and a normal transmission mode of operation. The transmitter includes a signal generator; a digital predistortion, DPD, circuit; and a first frequency shift circuit to frequency shift a signal for transmission in a first frequency direction. A feedback path and a second frequency shift circuit frequency shifts a fed back power amplified predistorted signal portion in a second frequency direction opposite to the first frequency direction. A calibration engine, receives and compares a digital baseband signal representative of a signal for transmission with the fed back power amplified predistorted signal portion shifted in the second frequency direction to determine at least one DPD compensation value only during a training mode of operation.

    ELECTRONIC DEVICE AND METHOD FOR CALIBRATING TEMPERATURE RELATED SCATTERING MATRIX OF TEMPERATURE SENSITIVE DEVICE
    2.
    发明申请
    ELECTRONIC DEVICE AND METHOD FOR CALIBRATING TEMPERATURE RELATED SCATTERING MATRIX OF TEMPERATURE SENSITIVE DEVICE 有权

    公开(公告)号：US20250164320A1

    公开(公告)日：2025-05-22

    申请号：US18510685

    申请日：2023-11-16

    Applicant: MEDIATEK INC.

    Inventor： Kuo-Hao Chen ,  Toru Matsuura

    IPC: G01K7/02 ,  G01K1/02 ,  G01K1/024 ,  G01K15/00

    Abstract: An electronic device and a method for calibrating a temperature related scattering matrix (S-matrix) of a temperature sensitive device are provided. The electronic device includes a temperature sensitive device for receiving a forward signal and a reverse signal corresponding to a desired signal and a calibration kit for providing a switchable impedance. During a first phase, the electronic device operates in a first temperature, and multiple first calculation results are calculated according to the forward signal and the reverse signal by setting the switchable impedance to be multiple impedances, respectively. During a second phase, the electronic device operates in a second temperature, and multiple second calculation results are calculated according to the forward signal and the reverse signal by setting the switchable impedance to be the multiple impedances, respectively. In addition, the temperature related S-matrix is calibrated according to the multiple first calculation results and the multiple second calculation results.

    Transmitter, communication unit and method for limiting spectral re-growth
    3.
    发明授权
    Transmitter, communication unit and method for limiting spectral re-growth 有权

    公开(公告)号：US10153794B2

    公开(公告)日：2018-12-11

    申请号：US15662903

    申请日：2017-07-28

    Applicant: MediaTek, Inc.

    Inventor： Toru Matsuura ,  Paul Cheng Po Liang

    IPC: H04B1/04 ,  H04L27/36 ,  H04L25/03 ,  H03F3/24 ,  H03F1/32 ,  H04B1/00

    Abstract: A transmitter includes a signal generator arranged to generate a digital baseband signal representative of a signal for transmission; a digital predistortion, DPD, circuit configured to predistort the digital baseband signal; and a power amplifier is arranged to amplify the predistorted signal. The DPD circuit includes a first signal shaping circuit operably coupled to the signal generator and the DPD predistortion circuit and configured to receive the generated digital signal and apply first envelope shaping to shape the predistortion applied to at least the amplitude of the generated digital signal and produce a first DPD signal; a second signal shaping circuit operably coupled to the signal generator and an output of the DPD predistortion circuit and configured to receive and apply the second envelope shaped digital signal to the first DPD signal and produce a second envelope shaped DPD signal. A multiplier is configured to receive and multiply the digital signal and the second envelope shaped DPD signal and output a digitally predistorted signal for transmission.

    Front-End Module And Coupling Compensation For Closed-Loop Digital Pre-Distortion System
    5.
    发明申请
    Front-End Module And Coupling Compensation For Closed-Loop Digital Pre-Distortion System 审中-公开
    闭环数字预失真系统的前端模块和耦合补偿

    公开(公告)号：US20160105299A1

    公开(公告)日：2016-04-14

    申请号：US14972038

    申请日：2015-12-16

    Applicant: MediaTek Inc.

    Inventor： YuenHui Chee ,  Fei Song ,  James Wang ,  Toru Matsuura ,  Osama K.A. Shana'a ,  Chiyuan Lu

    IPC: H04L27/00 ,  H03F3/21 ,  H03F1/02 ,  H03F3/19 ,  H04L25/08 ,  H04B1/40

    CPC classification number: H04L27/0002 ,  H03F1/0205 ,  H03F1/3241 ,  H03F1/3247 ,  H03F3/189 ,  H03F3/19 ,  H03F3/20 ,  H03F3/245 ,  H03F2200/294 ,  H03F2200/451 ,  H03F2201/3236 ,  H04B1/0475 ,  H04B1/40 ,  H04B2001/0425 ,  H04L25/08 ,  H04L27/36 ,  H04L27/368

    Abstract: Examples of front-end modules, apparatuses and methods for coupling compensation in a closed-loop digital pre-distortion (DPD) system are described. The closed-loop DPD circuit may include a PA and a loopback path. The PA may receive a PA input signal and amplify the PA input signal to provide a PA output signal proportional to a product of the PA input signal and a gain of the PA. The loopback path may receive the PA output signal to output a loopback signal. A forward coupling and a backward coupling may exist between the PA input signal and an output of the loopback path. The output of the loopback path may be proportional to a product of the PA output signal and a gain of the loopback path. The loopback path may include a coupling cancellation mechanism configured to cancel couplings between the PA input signal and the loopback signal.

    Abstract translation: 描述了用于在闭环数字预失真（DPD）系统中耦合补偿的前端模块，装置和方法的示例。 闭环DPD电路可以包括PA和环回路径。 PA可以接收PA输入信号并放大PA输入信号，以提供与PA输入信号的乘积和PA的增益成比例的PA输出信号。 环回路径可以接收PA输出信号以输出环回信号。 在PA输入信号和环回路径的输出之间可能存在正向耦合和反向耦合。 环回路径的输出可能与PA输出信号与环回路径的增益的乘积成比例。 环回路径可以包括被配置为消除PA输入信号和环回信号之间的耦合的耦合消除机构。

    ELECTRONIC DEVICE AND METHOD FOR ESTIMATING SCATTERING PARAMETERS OF TWO-PORT NETWORK
    7.
    发明申请
    ELECTRONIC DEVICE AND METHOD FOR ESTIMATING SCATTERING PARAMETERS OF TWO-PORT NETWORK 有权

    公开(公告)号：US20250112665A1

    公开(公告)日：2025-04-03

    申请号：US18375997

    申请日：2023-10-03

    Applicant: MEDIATEK INC.

    Inventor： Kuo-Hao Chen ,  Toru Matsuura

    IPC: H04B1/44 ,  H04B17/14

    Abstract: An electronic device and a method for estimating scattering parameters of a two-port network are provided. The electronic device includes a two-port network, a directional coupler, an input calibration kit placed in front of the two-port network, an output calibration kit placed behind the two-port network, and a control switch connected between the directional coupler and the two-port network. The directional coupler transmits a desired signal and receives a forward signal and a reverse signal from the two-port network. When the control switch is turned off, input calculation results are calculated according to the forward signal and the reverse signal by controlling the input calibration kit. When the control switch is turned on, output calculation results are calculated according to the forward signal and the reverse signal by controlling the output calibration kit. The scattering parameters are estimated according to the input calculation results and the output calculation results.

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