公开(公告)号：US20250105928A1

公开(公告)日：2025-03-27

申请号：US18471345

申请日：2023-09-21

Applicant: QUALCOMM INCORPORATED

Inventor： Cheng-Han WANG ,  Varun Amar REDDY ,  Qi ZHOU ,  Hsin-Hsu CHEN ,  Liang ZHAO ,  Koorosh AKHAVAN ,  Yi ZENG ,  Chan Hong PARK ,  Le Nguyen LUONG

IPC: H04B17/21 ,  H04B17/00

Abstract: A system for radio frequency (RF) residual sideband (RSB) calibration includes a complex (in phase/quadrature (I/Q)) signal receiver, a signal generator configured to generate a transmit (Tx) signal, a first phase shifter operably coupled to the real signal transmitter, a first signal combiner configured to combine a receive (Rx) signal with the transmit (Tx) signal to generate a first combined signal, a second phase shifter configured to provide a selected phase shift to the first combined signal, and a complex downconverter configured to generate an in phase Rx signal and a quadrature Rx signal alternatively using an in phase LO signal and a quadrature LO signal to generate one or more signals indicative of relative Tx-Rx LO phase (θ), amplitude (A), Tx LO I/Q phase mismatch (ε), Rx I/Q amplitude mismatch (α), and Rx I/Q phase mismatch (φ) at the output of the complex receiver.