公开(公告)号：US20210167739A1

公开(公告)日：2021-06-03

申请号：US17174956

申请日：2021-02-12

申请人： Huawei Technologies Co., Ltd.

发明人： Yaqi Hu

IPC分类号： H03F1/32 ,  H03F3/45

摘要： An amplifier circuit includes a primary differential amplifier circuit connected to receive a differential input and provide a primary differential output with a first non-linearity. A secondary differential amplifier circuit is connected to receive the differential input. The secondary differential amplifier circuit is configured to generate a secondary differential output with a second non-linearity. The secondary differential output and the primary differential output are coupled together with opposing polarities such that the second non-linearity cancels out at least the first non-linearity.

公开(公告)号：US20210167734A1

公开(公告)日：2021-06-03

申请号：US17093362

申请日：2020-11-09

申请人： Skyworks Solutions, Inc.

发明人： Sabah Khesbak ,  Serge Francois Drogi ,  Florinel G. Balteanu

IPC分类号： H03F1/02 ,  H03G3/30 ,  H03G3/00 ,  H03G1/00 ,  H03F1/32 ,  H03F3/195 ,  H03F3/24 ,  H03F3/45

摘要： Apparatus and methods for envelope tracking systems with automatic mode selection are provided herein. In certain configurations, a power amplifier system includes a power amplifier configured to provide amplification to a radio frequency signal and to receive power from a power amplifier supply voltage, and an envelope tracker including a signal bandwidth detection circuit configured to generate a detected bandwidth signal based on processing an envelope signal corresponding to an envelope of the radio frequency signal. The envelope tracker further includes a switch bank configured to receive a plurality of regulated voltages, a filter configured to filter an output of the switch bank to generate the power amplifier supply voltage, and a mode control circuit configured to control a filtering characteristic of the filter based on the detected bandwidth signal.

公开(公告)号：US11025203B2

公开(公告)日：2021-06-01

申请号：US16944453

申请日：2020-07-31

申请人： SOLiD, INC.

发明人： Kwangnam Seo ,  Doyoon Kim ,  Hyoungho Kim ,  Daesung Baek

IPC分类号： H04B1/04 ,  H03F1/32 ,  H04L25/03 ,  H03F3/19 ,  H03F3/24

摘要： The inventive concept relates to a communication device comprising a DPD processor configured to output a plurality of pre-distorted signals by pre-distorting each of a plurality of input signals using an extracted feedback signal, a first signal combiner configured to combine a plurality of feedback signals corresponding to the plurality of pre-distorted signals and output a combined feedback signal, an analog-to-digital converter configured to convert the combined feedback signal into a digital signal and output a digital-converted combined feedback signal and a signal extractor configured to extract the digital-converted combined feedback signal and output the extracted feedback signal.

公开(公告)号：US11018633B2

公开(公告)日：2021-05-25

申请号：US16752017

申请日：2020-01-24

申请人： Samsung Electronics Co., Ltd.

发明人： Liangbin Li ,  Gennady Feygin ,  Pranav Dayal

IPC分类号： H04B1/04 ,  H03F1/32 ,  H04W52/42 ,  H03F1/02 ,  H03F3/24 ,  H03F3/21

摘要： A method and an apparatus are provided for calibrating digital pre-distortion (DPD) of an electronic device. A respective signal is received, by each of a first plurality of receiving antennas, from each of a second plurality of transmitting antennas. A DPD function is determined for each of the second plurality of transmitting antennas based on the received signals. A combined DPD function of the second plurality of transmitting antennas is determined based on the DPD functions and phase shifter settings associated with the second plurality of transmitting antennas.

公开(公告)号：US20210152134A1

公开(公告)日：2021-05-20

申请号：US17068034

申请日：2020-10-12

申请人： MEDIATEK INC.

发明人： Sung-Han WEN

IPC分类号： H03F1/34 ,  H03F1/32

摘要： A high-linearity amplifier including a main operational amplifier, a feedback circuit, and a compensation circuit is shown. The feedback circuit couples an output signal of the main operational amplifier to an input port of the main operational amplifier. The compensation circuit is coupled to the input port of the main operational amplifier to compensate for the non-linearity of the feedback circuit. A signal coupled to the input port of the main operational amplifier through the compensation circuit has an inverse phase compared to the output signal of the main operational amplifier.

公开(公告)号：US11011819B2

公开(公告)日：2021-05-18

申请号：US16636156

申请日：2017-09-14

申请人： Telefonaktiebolaget LM Ericsson (publ)

发明人： Xiaoqin Zhang ,  Yilin Chen ,  Jun Ding ,  Xiaolong Pan

IPC分类号： H01P5/18 ,  H03F1/02 ,  H03F1/32 ,  H03F3/21 ,  H04B1/04

摘要： A directional coupler and a method for manufacturing the same are disclosed. According to an embodiment, the directional coupler comprises a first transmission line configured to receive an input signal. The directional coupler further comprises a second transmission line that can be coupled to the first transmission line by electromagnetic coupling to output a coupled signal. The first transmission line is further configured to act as a quarter-wave impedance transformer. A radio transmitter comprising the directional coupler and a radio device comprising the radio transmitter are also disclosed.

公开(公告)号：US10998863B2

公开(公告)日：2021-05-04

申请号：US16133282

申请日：2018-09-17

申请人： Analog Devices, Inc.

发明人： Christopher John Day

IPC分类号： H03F3/45 ,  H03F1/32 ,  H03F3/213 ,  H03F3/24 ,  H03F3/195 ,  H03F1/22 ,  H03M1/00 ,  H03M1/06 ,  H03M1/18 ,  H04B1/04

摘要： Techniques for monitoring a distortion signal of a power amplifier circuit, where the output of a distortion monitoring circuit includes little or no fundamental signal and closely represents the actual distortion of the amplifier circuit of a wired communications system. The power amplifier circuit can generate a distortion feedback signal that does not affect the power amplifier's output power capability, e.g., no inherent loss in the fundamental output of the amplifier. That is, using a distortion monitor circuit, the power amplifier circuit can resolve a distortion feedback signal from the intended output signal of the output power amplifier circuit.

公开(公告)号：US20210126601A1

公开(公告)日：2021-04-29

申请号：US17134386

申请日：2020-12-26

申请人： SMARTER MICROELECTRONICS (GUANG ZHOU) CO., LTD.

发明人： Qiang SU ,  Ping LI

IPC分类号： H03F3/24 ,  H03F3/195 ,  H03F1/32

摘要： A power amplifier includes: a power amplification circuit and a linearity compensation circuit; and herein the linearity compensation circuit is connected between a transistor amplification circuit and a biasing circuit of the power amplification circuit, to linearly compensate a nonlinear distortion of the power amplification circuit.

公开(公告)号：US10992269B2

公开(公告)日：2021-04-27

申请号：US16032423

申请日：2018-07-11

申请人： FUJITSU LIMITED

发明人： Tetsuro Ishiguro ,  Atsushi Yamada ,  Junji Kotani ,  Norikazu Nakamura ,  Kozo Makiyama

IPC分类号： H01L31/072 ,  H03F3/19 ,  H01L29/66 ,  H01L29/778 ,  H01L29/207 ,  H01L21/02 ,  H03F1/32 ,  H01L29/20

摘要： A compound semiconductor device includes a first compound semiconductor layer containing a p-type impurity, a second compound semiconductor layer disposed over the first compound semiconductor layer and containing InGaN, an electron transit layer disposed over the second compound semiconductor layer, and an electron supply layer disposed over the electron transit layer.

公开(公告)号：US10985705B2

公开(公告)日：2021-04-20

申请号：US16696130

申请日：2019-11-26

申请人： HUAWEI TECHNOLOGIES CO., LTD.

发明人： Vorobyev Andrey ,  Yiwei Hong ,  Ting Li

IPC分类号： H03F1/32 ,  H04B1/04 ,  H04B17/336 ,  H04L27/36

摘要： The present disclosure relates to pre-distortion processing methods and apparatus. One example apparatus includes a first pre-distortion part and a second pre-distortion part. The first pre-distortion part includes N digital pre-distortion (DPD) processors. The first pre-distortion part and the second pre-distortion part perform pre-distortion processing on a signal to support a power amplifier in performing linear amplification on the signal.