公开(公告)号：US20220286158A1

公开(公告)日：2022-09-08

申请号：US17191535

申请日：2021-03-03

Applicant: Apple Inc.

Inventor： Krishna Chaitanya Reddy Gangavaram ,  Ali Parsa

IPC: H04B1/44

Abstract: An electronic device may include wireless circuitry with a baseband processor, a transceiver, and an antenna. The transceiver may include a transmit path, a receive path, and a loopback path that couples the transmit path to the receive path. A passive all-pass filter may be interposed on the loopback path. Control circuitry may calibrate I/Q mismatch of the wireless circuitry using the all-pass filter to optimize the radio-frequency performance of the wireless circuitry. Performing I/Q mismatch calibration using the all-pass filter may serve to minimize area consumption in the transceiver, may minimize calibration time, and may allow for calibration over a relatively wide bandwidth.

公开(公告)号：US10122391B2

公开(公告)日：2018-11-06

申请号：US14870768

申请日：2015-09-30

Applicant: Apple Inc.

Inventor： Navid Lashkarian ,  Ehsan Adabi ,  Albert Chia-Wen Jerng ,  Arya Behzad ,  Ali Parsa

IPC: H04B1/04 ,  H04L27/36 ,  H03F1/32 ,  H03C5/00

Abstract: Systems and method provided herein relate to reducing distortion of signals introduced by components on a phase path of a radio frequency system polar architecture. To reduce phase path distortion, a pre-distortion is introduced prior to a distortion caused by the components on the phase path. The pre-distortion in conjunction with the component distortion results in a transmission signal that forms its expected shape.