公开(公告)号：US20210013898A1

公开(公告)日：2021-01-14

申请号：US16926261

申请日：2020-07-10

Applicant: NEWRACOM, Inc.

Inventor： Ryunwoo KIM ,  Seungyun LEE ,  Jaeyoung RYU ,  Jeongki CHOI ,  Jonghoon PARK ,  Changhun SONG

IPC: H03M1/40 ,  H03M1/10

Abstract: A method is described that is performed by a calibration system. The method includes determining a set of perturbation values for configuring an analog-to-digital converter of the calibration system; generating a set of digital test values for determining the accuracy of the analog-to-digital converter; and applying the set of perturbation values to the set of digital test values to generate a set of modified test values, wherein the set of perturbation values are digital values that are applied to the set of digital test values in the digital domain.

公开(公告)号：US20230370099A1

公开(公告)日：2023-11-16

申请号：US18316050

申请日：2023-05-11

Applicant: NEWRACOM, Inc.

Inventor： Seong-Sik MYOUNG ,  Ryunwoo KIM ,  Jong-Han LIM ,  Jeongki CHOI ,  Jaeyoung RYU

IPC: H04B1/04 ,  H04L27/00

CPC classification number: H04B1/0475 ,  H04L27/0008

Abstract: A method for calibrating a radio frequency (RF) transmitter to compensate for a frequency-dependent in-phase quadrature (FDIQ) mismatch is disclosed. The method may include determining in-phase quadrature (IQ) amplitude and phase mismatches of the RF transmitter for a lower side band (LSB) and an upper side band (USB), determining a FDIQ mismatch based on linear fitting the IQ amplitude and phase mismatches for the LSB and the USB, modifying the FDIQ mismatch based on flipping a FDIQ phase mismatch in the LSB and flipping a FDIQ phase mismatch in the USB to generate a modified FDIQ mismatch, determining Fourier coefficients based on applying an inverse fast Fourier transform to the modified FDIQ mismatch, and determining FIR coefficients for a finite impulse response (FIR) filter of the RF transmitter based on windowing the Fourier coefficients.