公开(公告)号：US10581478B1

公开(公告)日：2020-03-03

申请号：US16274529

申请日：2019-02-13

Applicant: Marvell International Ltd.

Inventor： Sai-Wang Tam ,  Randy Tsang ,  Ovidiu Carnu ,  Donghong Cui ,  Amir Ghaffari ,  Wai Lau ,  Timothy Loo ,  Alden C. Wong

IPC: H03F3/191 ,  H04B1/18 ,  H04B1/04

Abstract: Radio-frequency front-end circuitry includes an output terminal, a receive amplifier controllably coupled to the output terminal, at least one transmit amplifier controllably inductively coupled to the output terminal, and at least one impedance element controllably coupled between ground and one of the at least one transmit amplifier to reduce degradation of output of the radio-frequency front-end circuitry when the at least one transmit amplifier is not in use. In differential signaling, there is an impedance element between ground and each pole of the differential signal. A second transmit amplifier may generate second transmit signals and harmonics of the second transmit signals, and the second transmit amplifier may be switchably connected to the output of a first transmit amplifier so that output of the second transmit amplifier is filtered by the one of the first transmit amplifier. The transmit amplifiers may include a WiFi power amplifier and a BLUETOOTH® power amplifier.