公开(公告)号：US20240243731A1

公开(公告)日：2024-07-18

申请号：US18559562

申请日：2022-11-08

Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY

Inventor： Zhijian CHEN ,  Bin LI ,  Guangyin FENG ,  Shan GAO ,  Zhaohui WU

IPC: H03H11/04 ,  H03F3/45 ,  H03H11/12

CPC classification number: H03H11/0472 ,  H03F3/45475 ,  H03H11/1204 ,  H03F2200/261 ,  H03F2200/375

Abstract: A calibration method and a tuning method for an on-chip differential active RC filter are provided. The calibration method comprises: obtaining zero-crossing time of a differential signal outputted by a single-pole point real number filter by analyzing the single-pole point real number filter; setting a reference clock period according to the relationship between the zero-crossing time and the bandwidth of the single-pole point real number filter, and setting a calibration working time sequence according to the reference clock period; and scanning an RC configuration of an RC array according to the calibration working time sequence to realize calibration of the RC array.

公开(公告)号：US20220294459A1

公开(公告)日：2022-09-15

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 ,  H03L7/085 ,  H03L7/081

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.