公开(公告)号：US20190020317A1

公开(公告)日：2019-01-17

申请号：US16031834

申请日：2018-07-10

Applicant: QUALCOMM Incorporated

Inventor： Jing-Hwa CHEN ,  Jisun RYU ,  Yan Kit Gary HAU ,  Yanjie SUN ,  Xinwei WANG ,  Xiangdong ZHANG

IPC: H03F1/52 ,  H03F3/21 ,  H03F1/02

Abstract: Certain aspects of the present disclosure provide methods and apparatus for current-limiting protection of an amplifier, such as a power amplifier in a radio frequency (RF) front-end. One example current-limiting circuit generally includes a node coupled to a current source, a plurality of current-sinking devices coupled to the node, one or more switches coupled between the node and at least one of the plurality of current-sinking devices, and a bias circuit having an input coupled to the node and an output for coupling to an input of the amplifier.

公开(公告)号：US20240040470A1

公开(公告)日：2024-02-01

申请号：US17816602

申请日：2022-08-01

Applicant: QUALCOMM Incorporated

Inventor： Ryan Scott Castro SPRING ,  Jing-Hwa CHEN ,  Rakesh JALOTA ,  Jungsik PARK ,  Pushpak Rajan SARANG

IPC: H04W40/20 ,  H04B1/44 ,  H04W4/44

CPC classification number: H04W40/20 ,  H04B1/44 ,  H04W4/44 ,  G07B15/063

Abstract: Certain aspects of the present disclosure provide apparatus and methods for cellular vehicle-to-everything (C-V2X) stationary object detection. One example radio frequency (RF) front-end circuit generally includes a directional coupler having a first port for coupling to an antenna and having a second port; and a delta switch having a first port coupled to the second port of the directional coupler, having a second port, and having a third port for coupling to a receive path for detection of a stationary object. The RF front-end circuit and methods for C-V2X stationary object detection may allow for concurrent (i) stationary object detection and (ii) C-V2X signal reception or transmission.

公开(公告)号：US20230034531A1

公开(公告)日：2023-02-02

申请号：US17390166

申请日：2021-07-30

Applicant: QUALCOMM Incorporated

Inventor： Zhenying LUO ,  Yazhou WANG ,  Xinwei WANG ,  Jing-Hwa CHEN ,  Xiangdong ZHANG

IPC: H03F3/24 ,  H03F1/52 ,  H03F1/56 ,  H03F3/195

Abstract: Methods and apparatus for limiting the input voltage (swing) of a power amplifier, such as a power amplifier in a radio frequency (RF) front-end of a wireless device. One example radio frequency front-end circuit generally includes a power amplifier, a matching circuit having an output coupled to an input of the power amplifier, and an overvoltage protection circuit coupled to the matching circuit. With an overvoltage protection circuit coupled to the matching circuit in this manner, the power amplifier may have enhanced ruggedness performance.

公开(公告)号：US20210273615A1

公开(公告)日：2021-09-02

申请号：US16804929

申请日：2020-02-28

Applicant: QUALCOMM Incorporated

Inventor： Jing-Hwa CHEN ,  Junzhi YU ,  Yan Kit Gary HAU ,  Guoqing FU ,  Xinwei WANG ,  Xiangdong ZHANG

IPC: H03F1/56 ,  H03F3/24 ,  H03F3/195 ,  H03F3/60 ,  H03F1/02

Abstract: Certain aspects of the present disclosure are directed to an amplifier. The amplifier may include a transistor coupled to an output of the amplifier, and a resonator coupled between the output of the amplifier and a reference potential node, a resonant frequency of the resonator being set to be at a subharmonic of a fundamental frequency of the amplifier, and an impedance of the resonator being greater than a load impedance of the amplifier at the fundamental frequency of the amplifier.

公开(公告)号：US20190089314A1

公开(公告)日：2019-03-21

申请号：US15706242

申请日：2017-09-15

Applicant: QUALCOMM Incorporated

Inventor： Yanjie SUN ,  Jing-Hwa CHEN ,  Zhenying LUO ,  Yan Kit Gary HAU ,  Jisun RYU ,  Ashwin DUGGAL ,  Kihun CHANG ,  ZhenQi CHEN ,  Xinwei WANG ,  Xiangdong ZHANG

IPC: H03F1/52 ,  H03F1/56 ,  H03F1/02 ,  H03F3/24 ,  H03F3/195

CPC classification number: H03F1/52 ,  H03F1/0205 ,  H03F1/565 ,  H03F3/195 ,  H03F3/245 ,  H03F2200/171 ,  H03F2200/225 ,  H03F2200/318 ,  H03F2200/387 ,  H03F2200/391 ,  H03F2200/411 ,  H03F2200/426 ,  H03F2200/451 ,  H04B1/04 ,  H04B1/48 ,  H04B1/52 ,  H04B2001/0408

Abstract: Certain aspects of the present disclosure provide methods and apparatus for operating a power amplifier. In one example, the apparatus includes a power amplifier configured to amplify an input signal having a frequency to produce a radio frequency (RF) output signal at an output and a harmonic tuning circuit coupled between a power supply and the power amplifier output, the harmonic tuning circuit configured to reduce a current or voltage provided to the power amplifier via a resonance at one or more harmonics of the frequency of the input signal.