公开(公告)号：US11641208B2

公开(公告)日：2023-05-02

申请号：US17742336

申请日：2022-05-11

Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY

Inventor： Zhijian Chen ,  Ziying Wu ,  Changjian Zhou ,  Pengfei Yu ,  Bin Li ,  Shaolin Zhou

IPC: H03L7/099 ,  H03L7/081 ,  H03L7/085

Abstract: A frequency locking method for a phase-locked loop comprises the following steps: S1, a frequency control module controls a numerically controlled oscillator to obtain an maximum output frequency and a minimum output frequency; S2, obtain a minimum frequency ratio and a maximum frequency ratio by means of a time-to-digital converter and the frequency control module; S3, calculate a first frequency control word and a first frequency ratio according to the minimum frequency ratio and the maximum frequency ratio; S4, the frequency control module uses the Newton's iterative method to recalculate a new frequency control word; S5, obtain a new frequency ratio according to the new frequency control word; S6, if the new frequency ratio is within an error range, end iteration and stably output the new frequency control word, and otherwise, jump to step S4.

公开(公告)号：US12241948B2

公开(公告)日：2025-03-04

申请号：US18655857

申请日：2024-05-06

Applicant: CHINA ELECTRONIC PRODUCT RELIABILITY AND ENVIRONMENTAL TESTING RESEARCH INSTITUTE (THE FIFTH ELECTRONIC RESEARCH INSTITUTE OF MINISTRY OF INDUSTRY AND INFORMATION TECHNOLOGY) (CEPREI) ,  SOUTH CHINA UNIVERSITY OF TECHNOLOGY

Inventor： Weiheng Shao ,  Yinghui Chen ,  Yiqiang Chen ,  Changjian Zhou

IPC: G01R33/025 ,  G01R27/32 ,  G01R35/00

Abstract: The present disclosure relates to an asymmetric compensation method and apparatus for a two-port near field probe, a device, and a storage medium. The method includes: obtaining a first scattering parameter collected by a symmetric two-port network established based on a symmetric two-port near field probe; obtaining a second scattering parameter collected by an asymmetric two-port network established based on an asymmetric element; obtaining an overall response of a calibration network in a magnetic field environment, the calibration network being established based on the symmetric two-port near field probe and the asymmetric element; calculating a calibration factor based on the scattering parameter of the symmetric two-port near field probe, the scattering parameter of the asymmetric element, and the overall response of the calibration network in the magnetic field environment; and compensating the symmetric two-port near field probe according to a calibration factor.

公开(公告)号：US20240402265A1

公开(公告)日：2024-12-05

申请号：US18655857

申请日：2024-05-06

Applicant: CHINA ELECTRONIC PRODUCT RELIABILITY AND ENVIRONMENTAL TESTING RESEARCH INSTITUTE ,  SOUTH CHINA UNIVERSITY OF TECHNOLOGY

Inventor： Weiheng Shao ,  Yinghui Chen ,  Yiqiang Chen ,  Changjian Zhou

IPC: G01R33/025 ,  G01R27/32 ,  G01R35/00

Abstract: The present disclosure relates to an asymmetric compensation method and apparatus for a two-port near field probe, a device, and a storage medium. The method includes: obtaining a first scattering parameter collected by a symmetric two-port network established based on a symmetric two-port near field probe; obtaining a second scattering parameter collected by an asymmetric two-port network established based on an asymmetric element; obtaining an overall response of a calibration network in a magnetic field environment, the calibration network being established based on the symmetric two-port near field probe and the asymmetric element; calculating a calibration factor based on the scattering parameter of the symmetric two-port near field probe, the scattering parameter of the asymmetric element, and the overall response of the calibration network in the magnetic field environment; and compensating the symmetric two-port near field probe according to a calibration factor.