现代电子技术Issue(9)：148-153,6.
高性能晶体振荡器及频率校准电路设计
Design of high-performance crystal oscillator and frequency calibration circuit
摘要
Abstract
A high-performance Pierce crystal oscillator and frequency calibration circuit were designed. A depletion mode NMOS transistor is used to obtain 1.5 V output reference circuit with low-power dissipation. Crystal oscillating circuit uses a power supply of 1.5 V reference voltage to reduce the power consumption and improve the output frequency precision of the oscillator. In order to further increase the output frequency precision,fuse trimming circuit is integrated inside chip. The correction of the oscillating circuit output frequency after packaging is realized by adjustment of the crystal oscillator load capacitance. The correction range is -52.216~54.962 ppm,and the maximum correction step is 3.723 ppm. If the correction circuit of digital mode is inte-grated in the chip,this function can be used to correct temperature-related clock precision variation in system,including tempe-rature detection function. The correction range is -189.1~189.1 ppm,and the correction step is 3.05 ppm. A practical circuit is realized in a 0.5 μm-5 V COMS process. The die size is 0.842 mm×0.996 mm.关键词
晶体振荡器/耗尽型NMOS管/基准电压供电/内置晶振/高精度频率校准Key words
crystal oscillator/depletion mode NMOS transistor/voltage reference power supply/built-in crystal oscillator/high-accuracy frequency correction分类
信息技术与安全科学引用本文复制引用
鲍钰文,徐瑶,张金辉,高云..高性能晶体振荡器及频率校准电路设计[J].现代电子技术,2014,(9):148-153,6.基金项目
湖北省重大科技创新计划项目资助 （）
