公开(公告)号：US11923857B1

公开(公告)日：2024-03-05

申请号：US18102066

申请日：2023-01-26

Applicant: XILINX, INC.

Inventor： Hongtao Zhang ,  Ankur Jain ,  Yanfei Chen ,  Ronan Sean Casey ,  Winson Lin ,  Hsung Jai Im

IPC: H03L7/08 ,  H03L7/099 ,  H03M1/82

CPC classification number: H03L7/0802 ,  H03L7/0991 ,  H03M1/82

Abstract: Embodiments herein describe correcting nonlinearity in a Digital-to-Time Converter (DTC) by relaxing a DTC linearity requirement, which results in the correction being co-adapted with a DTC gain calibration loop which can operate in parallel with a DTC integral nonlinearity (INL) correction loop. In one embodiment, the DTC gain calibration loop and the DTC INL correction loop are constrained when determining a nonlinearity correction code to improve the likelihood they converge. Once determined, the nonlinearity correction code can be combined with an digital code output by a time-to-digital converter (TDC) to generate a phase difference between a reference clock and a feedback clock.