Qualcomm Incorporated

Jing-Hwa Chen

Xiangdong Zhang

Xinwei Wang

Yan Kit Gary Hau

Yanjie Sun

ZhenQi Chen

Zhenying Luo

Jisun Ryu

Guoqing Fu

Tianzuo Xi

Junzhi Yu

Haichuan Kang

Ashwin Duggal

Kihun Chang

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.

Stability improvement circuit for radio frequency (RF) power amplifiers

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.

Current-limiting circuit for a power amplifier

A circuit including a radio frequency (RF) amplifier including a transistor configured to receive an RF signal at its control terminal, a capacitor coupled to a first terminal of the transistor, an inductor coupled to a second terminal of the transistor, wherein the capacitor and inductor form a loop from the first terminal to the second terminal, wherein the loop bypasses a parasitic inductance between the second terminal and ground.

Systems and methods providing a matching circuit that bypasses a parasitic impedance

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.

Methods and apparatuses for ruggedizing a power amplifier against breakdown using harmonic tuning

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Sudbury, MA, United States of America

Jing-Hwa Chen