公开(公告)号：US12126310B2

公开(公告)日：2024-10-22

申请号：US18465910

申请日：2023-09-12

Applicant: Apple Inc.

Inventor： Nitesh Singhal

IPC: H03F3/24 ,  H04B1/40

CPC classification number: H03F3/245 ,  H04B1/40 ,  H03F2200/451

Abstract: An electronic device may include wireless circuitry with a processor, a transceiver, an antenna, and a front-end module coupled between the transceiver and the antenna. The front-end module may include one or more power amplifiers for amplifying a signal for transmission through the antenna. Radio-frequency power amplifier circuitry may include an amplifier, an input transformer for coupling radio-frequency input signals to the amplifier, an active inductor load coupled to the input transformer, and a second order intermodulation generation circuit configured to generate and inject a second order intermodulation product into the input transformer. The injected second order intermodulation product can be used to cancel out unwanted third order intermodulation products generated by the amplifier, which reduces intermodulation distortion experienced by the amplifier circuitry.

公开(公告)号：US20240063759A1

公开(公告)日：2024-02-22

申请号：US18466116

申请日：2023-09-13

Applicant: Apple Inc.

Inventor： Nitesh Singhal ,  Bo Yu ,  Kefei Wu

IPC: H03F1/26 ,  H04B1/40 ,  H03F3/19

CPC classification number: H03F1/26 ,  H04B1/40 ,  H03F3/19 ,  H03F2200/451 ,  H03F2200/09 ,  H03F2200/294

Abstract: Wireless circuitry can have an antenna connected to a transmitting amplifier and a receiving amplifier. The wireless circuitry may be operable in a transmit mode during which only the transmitting amplifier is active and in a receive mode during which only the receiving amplifier is active. The transmitting amplifier may be connected to the antenna via a balun and a radio-frequency coupler without an intervening switch that is enabled during the transmit mode and disabled during the receive mode. The transmitting amplifier may include input transistors, cascode transistors, first switches configured to selectively decouple gate terminals of the cascode transistors from a bias voltage, output capacitors, and second switches configured to selectively decouple the output capacitors from a ground line. The first and second switches are turned on during the transmit mode and are turned off during the receive mode to increase an output impedance of the transmitting amplifier.

公开(公告)号：US20240063758A1

公开(公告)日：2024-02-22

申请号：US17892869

申请日：2022-08-22

Applicant: Apple Inc.

Inventor： Nitesh Singhal ,  Bo Yu ,  Kefei Wu

IPC: H03F1/26 ,  H03F3/19 ,  H04B1/40

CPC classification number: H03F1/26 ,  H03F3/19 ,  H04B1/40 ,  H03F2200/451 ,  H03F2200/294 ,  H03F2200/09

Abstract: Wireless circuitry can have an antenna connected to a transmitting amplifier and a receiving amplifier. The wireless circuitry may be operable in a transmit mode during which only the transmitting amplifier is active and in a receive mode during which only the receiving amplifier is active. The transmitting amplifier may be connected to the antenna via a balun and a radio-frequency coupler without an intervening switch that is enabled during the transmit mode and disabled during the receive mode. The transmitting amplifier may include input transistors, cascode transistors, first switches configured to selectively decouple gate terminals of the cascode transistors from a bias voltage, output capacitors, and second switches configured to selectively decouple the output capacitors from a ground line. The first and second switches are turned on during the transmit mode and are turned off during the receive mode to increase an output impedance of the transmitting amplifier.