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：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.