公开(公告)号：US20220094313A1

公开(公告)日：2022-03-24

申请号：US17341159

申请日：2021-06-07

Applicant: Apple Inc.

Inventor： Seyed Mohammad Hossein Mohammadnezhad ,  Xi Yao ,  Aly Ismail

IPC: H03F3/24 ,  H03F3/195 ,  H03F1/22 ,  H03F3/68

Abstract: An electronic device may include wireless circuitry with a baseband processor, a transceiver circuit, a front-end module, and an antenna. The front-end module may include amplifier circuitry such as a low noise amplifier for amplifying received radio-frequency signals. The amplifier circuitry is operable in a non-carrier-aggregation mode and a carrier aggregation mode. The amplifier circuitry may include an input transformer that is coupled to multiple amplifier stages such as a common gate amplifier stage, a cascode amplifier stage, and a common source amplifier stage. The common gate amplifier stage may include switches for selectively activating a set of cross-coupled capacitors to help maintain input impedance matching in the non-carrier-aggregation mode and the carrier-aggregation mode. The common source amplifier stage may include additional switches for activating and deactivating the common source amplifier stage to help maintain the gain in the non-carrier-aggregation mode and the carrier-aggregation mode.