公开(公告)号：US20240250604A1

公开(公告)日：2024-07-25

申请号：US18099674

申请日：2023-01-20

Applicant: Apple Inc.

Inventor： David M. Signoff ,  Fei Wang ,  Kefei Wu ,  Song Hu ,  Morteza Nick ,  Xiang Guan

IPC: H02M1/32 ,  H02M3/07

CPC classification number: H02M1/32 ,  H02M3/07

Abstract: Radio frequency (RF) transmitters of a device (aggressor device) may unintentionally transmit a high-power output signal to antennas of a receiving device (victim device). In some RF systems, a victim device may have no or little protection between its antennas and transistors in an integrated circuit. Performance or lifetime of the transistors may be negatively impacted due to large voltage swings that may result from the high-power signal received from the aggressor device. To prevent or mitigate impact to performance or lifetime of the transistors due to the large voltage swings, protection circuitry including switches and a direct current (DC) power source (e.g., a charge pump) may be implemented at an input of a receiver of the victim device to shunt the power from sensitive circuit components of the victim device.

公开(公告)号：US20250105869A1

公开(公告)日：2025-03-27

申请号：US18471536

申请日：2023-09-21

Applicant: Apple Inc.

Inventor： Fei Wang ,  Xiang Guan

IPC: H04B1/40

Abstract: An electronic device may include wireless circuitry with a transmission line path coupled between a transceiver and antenna. An amplifier may be disposed on the transmission line path. The amplifier may have a reconfigurable matching network at its output. The network may have coupled lines such as transmission line segments or transformer coils. The coupled lines may couple an input port of the network to a load port and a control port of the network. The load port may be coupled to the antenna. The control port may be coupled to an adjustable termination. The control port may receive a control signal that configures the adjustable termination to exhibit an impedance selected based on a VSWR of the antenna. The impedance of the adjustable termination may be tuned so the amplifier sees a consistent load impedance at the load port even as the VSWR of the antenna changes over time.

公开(公告)号：US20250080066A1

公开(公告)日：2025-03-06

申请号：US18459262

申请日：2023-08-31

Applicant: Apple Inc.

Inventor： Fei Wang ,  Xiang Guan

IPC: H03F3/24 ,  H03F1/22

Abstract: Wireless circuitry is provided that includes at least a first amplifier, a second amplifier, and a power splitting transformer coupled to the first and second amplifiers. The first amplifier can include first input transistors, and the second amplifier can include second input transistors. The power splitting transformer can include a primary coil, a first secondary coil having terminals coupled to gate terminals of the first input transistors and having a center tap configured to receive a first bias voltage, and a second secondary coil having terminals coupled to gate terminals of the second input transistors and having a center tap configured to receive a second bias voltage. The first and second amplifiers may output signals to a power combining transformer. The power combining transformer can have a first primary coil, a second primary coil, and a secondary coil all disposed within a single compact transformer footprint.

公开(公告)号：US20240356192A1

公开(公告)日：2024-10-24

申请号：US18136168

申请日：2023-04-18

Applicant: Apple Inc.

Inventor： Fei Wang ,  Xiang Guan

IPC: H01P5/12 ,  H03F3/24

CPC classification number: H01P5/12 ,  H03F3/245 ,  H03F2200/451

Abstract: This disclosure is directed to a series Doherty power amplifier including two-transformers. The series Doherty combiner may include a first branch including a main amplifier and a first transformer coupled to a load. In particular, a primary inductor of the first transformer may be coupled to the main amplifier and a secondary inductor of the first transformer may couple to the load. The series Doherty combiner may also include a second branch including an auxiliary amplifier and a second transformer coupled to the secondary inductor of the first transformer. The second transformer may couple to the load via the secondary inductor of the first transformer. As such, the load is coupled in series to the first branch and is coupled in series to the second branch. Moreover, the load is coupled in shunt to the main amplifier and the auxiliary amplifier.