一种带温度补偿的高精度片上RC振荡器  

A High Accuracy On-Chip RC Oscillator with Temperature Compensation

作　　者：董春雷[1,2] 宁振球[2] 金星[1] 张正民[1,2] 万文艳[1,2] 

机构地区：[1]中国科学院上海微系统与信息技术研究所汽车电子工程中心,上海200050 [2]中国科学院大学,北京100049

出　　处：《微电子学》2015年第1期58-62,共5页Microelectronics

基　　金：国家极大规模集成电路制造装备及成套工艺重大专项(2012ZX02503-003)

摘　　要：介绍了一款带有高阶温度补偿和数字修调功能的高精度片上RC振荡器。由于采用了2阶温度补偿方案,该时钟振荡器在较宽的温度范围内实现了振荡频率的高稳定性。由于采用电流数字修调技术,因此减小了工艺漂移对输出中心频率的影响。另外,应用误差放大器及共源共栅结构提高了电源抑制特性,从而使振荡器精度得到显著提高。电路基于SMIC 0.18μm CMOS工艺设计。仿真结果显示,在温度范围为-40℃~125℃,电源电压波动为±10%,及不同的工艺角下,振荡器输出中心频率均为5 MHz,精度保持在±0.25%以内。同其他相似片上振荡器相比,在同样的温度变化、电压波动及工艺漂移的情况下,其频率稳定性显著提高。A high accuracy on-chip RC oscillator with high-order temperature compensation and digital current trimming was proposed.By using the second-order temperature compensation,a high stability of oscillating frequency was achieved within a broad temperature rang.Digital trimming current circuits were designed to reduce the variation of the output center frequency due to process variation.Also,error amplifiers and cascode architectures were designed to improve the power supply rejection,so the accuracy of the oscillator was increased significantly.The circuit was designed in SIMC 0.18μm CMOS technology.The simulation results showed that the output frequency of the oscillator was 5MHz with accuracy within±0.25%for all process corners at power supply from 3V to 3.6Vand temperature range from-45 ℃ to 125 ℃.Compared with other similar on-chip oscillators,the proposed circuit showed much better performances when the variations of the temperature,power supply and process were taken into account at the same time.

关 键 词：RC振荡电路 2阶温度补偿 工艺漂移 数字修调 

分 类 号：TN432[电子电信—微电子学与固体电子学]