电子元件与材料2025，Vol.44Issue(9)：1049-1057,9.DOI:10.14106/j.cnki.1001-2028.2025.1573
一种快速启动的高精度RC振荡器设计
Design of a high-precision RC oscillator with fast start
王硕 1辛晓宁 1任建1
作者信息
- 1. 沈阳工业大学信息科学与工程学院,辽宁沈阳 110870
- 折叠
摘要
Abstract
Based on the 0.18-μm CMOS process,a high-precision RC oscillator was designed for mixed-signal chips.The oscillation was achieved by dynamic flipping the upper and lower plates of the charging capacitor.The oscillator adopts a single-comparator fast-discharge structure to minimize the impact of capacitor discharge time on frequency stability.To suppress process variations and temperature drift,a low-temperature-drift constant current source was introduced as the current reference,and the charging current was calibrated in combination with a digital trimming circuit and a temperature compensation circuit.A bandgap reference voltage source and a low-dropout linear regulator(LDO)were integrated to provide a low-noise internal power supply,and reduce the impact of supply voltage fluctuations on frequency stability.Post-layout simulation results show that the oscillator generates a 2 MHz output frequency with a startup time of＜5 μs.The output frequency variation is less than±0.57％from-40 ℃ to 125 ℃ and less than±0.42％for a supply voltage from 2.5 V to 5.5 V.This design satisfies the requirements of mixed-signal chips for fast startup and high precision.关键词
RC振荡器/高精度/温度稳定性/电压稳定性Key words
RC oscillator/high precision/temperature stability/voltage stability分类
信息技术与安全科学引用本文复制引用
王硕,辛晓宁,任建..一种快速启动的高精度RC振荡器设计[J].电子元件与材料,2025,44(9):1049-1057,9.
