一种高频率稳定度模拟温度补偿晶体振荡器  

High Frequency Stability Analog Temperature Compensated Crystal Oscillator

作　　者：贺旭东 张一帆 董超 HE Xudong;ZHANG Yifan;DONG Chao(Southwest Integrated Circuit Design Co.,Ltd,Chongqing,Chongqing 400060,China)

机构地区：[1]重庆西南集成电路设计有限责任公司,重庆400060

出　　处：《压电与声光》2024年第5期685-689,694,共6页Piezoelectrics & Acoustooptics

摘　　要：介绍了一种高频率稳定度模拟温度补偿晶体振荡器。采用温度传感器,一阶、三阶、四阶、五阶电压函数发生器,加法器等单元电路产生温度补偿电压V_(C),再将V_(C)电压输入至压控振荡器中的变容二极管,对AT切型石英晶体频率进行温度补偿。相比于传统的直接型模拟温度补偿方案,该方案所设计的产品具有更小的体积,解决了间接型数字温度补偿方案频率突变的问题。采用0.18μm工艺加工芯片,芯片面积仅1.5 mm×1.2 mm。实测结果表明,在-40~85℃内补偿精度在±0.28×10^(-6)内,1 kHz相位噪声低于-143 dBc/Hz。This study proposes a high frequency stability analog temperature compensated crystal oscillator.A combination of temperature sensors,first-,third-,fourth-,and fifth-order function voltagegenerators,adders,and other unit circuits were utilized to generate the temperature compensation voltage V_(C).This wassubsequently input into the varactor diode in the VCO to compensate for the temperature vs.frequency of AT-cut quartz crystal.In comparison with traditional direct analog temperature compensation schemes,the proposed chipoffered a lower volume and resolved the frequency mutation issue that occurs in indirect digital temperature compensation schemes.The chip was fabricated using 0.18μm processwith a compact area of only 1.5 mm×1.2 mm.Measurement results demonstrated that the compensation accuracy was within±0.28×10^(-6)and the 1 kHz phase noise was lower than-143 dBc/Hz across a-40 to 85℃temperature range.

关 键 词：温度补偿 晶体振荡器 函数发生器 

分 类 号：TN384[电子电信—物理电子学] TN752.2