Crystal oscillator based on duty ratio measurement

US12375039B2 · kind B2 · utility

Assignees

• NANJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS · CN
• NANTONG INSTITUTE OF NANJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS CO., LTD. · CN

Inventors

• Zixuan Wang · 安丰镇, CN
• Xin Wang · Zhejiang, CN
• Zhikuang Cai · 安丰镇, CN
• Yufeng Guo · 安丰镇, CN
• Jiafei Yao · 安丰镇, CN

Key dates

• Filing date: May 11, 2023
• Grant date: Jul 29, 2025
• Expiry date: May 11, 2043

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03B2200/0094
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

Disclosed in the present invention is a crystal oscillator based on duty ratio measurement, comprising a first inverter, a resistor, a first load capacitor, a second load capacitor, first to fourth switches, a quartz crystal, a buffer, a sampling and holding module, a first comparator, a second comparator, a phase conversion module, a digital control module, and an energy injection module. One end of the quartz crystal is used for signal injection, a signal at the other end of the quartz crystal is sampled and processed, information representing phase error accumulation, i.e., a signal of which the duty ratio is continuously changing, is obtained by means of the first comparator, and finally the duty ratio is measured by means of the phase conversion module and the second comparator, so as to obtain an accurate moment of phase switching.