公开(公告)号：US20180331662A1

公开(公告)日：2018-11-15

申请号：US15975783

申请日：2018-05-10

Applicant: MEDIATEK INC.

Inventor： Ching-Shyang Maa ,  Chun-Hsien Peng ,  Hua-Lung Yang ,  I-No Liao ,  Chen-Jui Hsu ,  Jen-Yang Liu

IPC: H03F1/32 ,  H03F3/21 ,  H03F3/19 ,  H03F1/30

CPC classification number: H03F1/3258 ,  H03F1/30 ,  H03F3/19 ,  H03F3/21 ,  H03F2200/451 ,  H03F2200/468 ,  H03F2201/3209 ,  H03F2201/3224 ,  H03F2201/3233

Abstract: A method of reducing memory effect of a power amplifier (PA), for a look-up table (LUT) based memory digital pre-distortion (DPD) circuit of an electronic device is disclosed. The method comprises generating a pre-distorted signal according to a LUT including parameters of an input signal amplitude and an input signal delay associated with a bandwidth of a signal inputted to the memory DPD circuit, and outputting the pre-distorted signal to the PA for improving the nonlinearity of the PA.

公开(公告)号：US10277450B2

公开(公告)日：2019-04-30

申请号：US15716527

申请日：2017-09-27

Applicant: MEDIATEK INC.

Inventor： Wei-Chiang Li ,  Chen-Jui Hsu ,  Chun-Hsien Peng

IPC: H04B1/30 ,  H04B15/00 ,  H04L27/26 ,  H04L27/38

Abstract: A method employed by a circuit included within a receiver apparatus and configured for performing IQ mismatch compensation when receiver apparatus is operating under data reception mode includes: transforming a data signal, which is generated by a radio frequency receiver under the data reception mode, from time domain into a plurality of frequency bin signals in frequency domain; calculating to obtain at least one frequency domain calibration parameter according to the plurality of frequency bin signals in frequency domain; and, updating at least one coefficient parameter of IQ mismatch compensation according to the obtained at least one frequency domain calibration parameter, to make IQ mismatch compensation compensate IQ mismatch based on the updated at least one coefficient parameter.

公开(公告)号：US20240364433A1

公开(公告)日：2024-10-31

申请号：US18646748

申请日：2024-04-25

Applicant: MEDIATEK INC.

Inventor： Sin-Han Yang ,  Chen-Jui Hsu

IPC: H04B17/20 ,  H04B17/21

CPC classification number: H04B17/203 ,  H04B17/21

Abstract: A method for measuring a sensitivity of a receiver is provided. The method includes: during a first stage, controlling a signal generator to transmit an input test signal to an input node of the receiver, wherein the receiver generates an output test signal on a first output node of the receiver according to the input test signal; calculating a path loss from the input node of the receiver to the first output node of the receiver according to the input test signal and the output test signal; during a second stage, measuring an output noise power on a second output node of the receiver after a load is connected to the input node of the receiver; and calculating the sensitivity of the receiver according to the path loss and the output noise power. The load may be an antenna or a 50-ohm impedance load.

公开(公告)号：US11082013B2

公开(公告)日：2021-08-03

申请号：US15975783

申请日：2018-05-10

Applicant: MEDIATEK INC.

Inventor： Ching-Shyang Maa ,  Chun-Hsien Peng ,  Hua-Lung Yang ,  I-No Liao ,  Chen-Jui Hsu ,  Jen-Yang Liu

IPC: H03F3/04 ,  H03F1/32 ,  H03F3/21 ,  H03F3/19 ,  H03F1/30 ,  H03F1/02 ,  H03F3/24

Abstract: A method of reducing memory effect of a power amplifier (PA), for a look-up table (LUT) based memory digital pre-distortion (DPD) circuit of an electronic device is disclosed. The method comprises generating a pre-distorted signal according to a LUT including parameters of an input signal amplitude and an input signal delay associated with a bandwidth of a signal inputted to the memory DPD circuit, and outputting the pre-distorted signal to the PA for improving the nonlinearity of the PA.

公开(公告)号：US20180241606A1

公开(公告)日：2018-08-23

申请号：US15716527

申请日：2017-09-27

Applicant: MEDIATEK INC.

Inventor： Wei-Chiang Li ,  Chen-Jui Hsu ,  Chun-Hsien Peng

IPC: H04L27/38 ,  H04B15/00

CPC classification number: H04L27/3863 ,  H04B15/005

Abstract: A method employed by a circuit included within a receiver apparatus and configured for performing IQ mismatch compensation when receiver apparatus is operating under data reception mode includes: transforming a data signal, which is generated by a radio frequency receiver under the data reception mode, from time domain into a plurality of frequency bin signals in frequency domain; calculating to obtain at least one frequency domain calibration parameter according to the plurality of frequency bin signals in frequency domain; and, updating at least one coefficient parameter of IQ mismatch compensation according to the obtained at least one frequency domain calibration parameter, to make IQ mismatch compensation compensate IQ mismatch based on the updated at least one coefficient parameter.