一种自检测快起振8 MHz CMOS晶振电路设计

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关键词：晶振电路；负阻增强；快速起振；差分放大；检测电路

中图分类号：TN431.1

文献标识码：A

DOI：10.14106/j.cnki.1001-2028.2025.1287

引用格式：陈小钰， 郑迅， 倪屹. 一种自检测快起振8 MHz CMOS晶振电路设计 [J].电子元件与材料， 2025， 44（1）： 71-78.

Reference format：  CHEN Xiaoyu， ZHENG Xun， NI Yi. A self-testing fast start-up 8 MHz CMOS oscillator circuit design [J]. Electronic Components and Materials， 2025， 44（1）： 71-78.

A self-testing fast start-up 8 MHz CMOS oscillator circuit design

CHEN Xiaoyu1， ZHENG Xun2， NI Yi1

（1. School of Integrated Circuits， Jiangnan University， Wuxi 214122， Jiangsu Province， China；2. Zhejiang Chituo

Technology Co.， Ltd.， Wuxi 214122， Jiangsu Province， China）

Abstract： In microprocessors， a self-testing fast start-up 8MHz CMOS crystal oscillator circuit was proposed to solve the problem of long starting time of traditional Pierce crystal oscillators in high-speed external clock sources. A positive feedback loop was established through the capacitor between the self-start circuit and differential amplifier circuit in order to boost the bias current of the operational amplifier and speed up the response time of the output signal. The waveform shaping and level shifting were completed with the switching duty cycle shaping circuit， and the conversion from the internal integrated power supply to the digital power supply was realized. In addition， to ensure the accuracy and reliability of the crystal oscillator circuit， a self-detection mechanism based on capacitor charging and discharging and frequency division circuit was designed to realize real-time monitoring of the frequency. The circuit was fabricated using a 90 nm 4P6M CMOS process with an effective chip area of 126 μm×77 μm. The simulation and test results show that the circuit can generate an oscillating signal with the output waveform duty cycle of 50.1% and frequency of 8 MHz in 600 μs under the supply voltage of 5 V and operating current of 160 μA.

Keywords： crystal oscillator circuit; negative resistance enhancement; fast start-up; differential amplification; detection circuit

微处理器的运行依赖于时钟的精确控制，而时钟频率的稳定性取决于振荡器的可靠性。（剩余10029字）