一款用于TCXO的三次方函数补偿电路  

Cubic Function Compensation Circuit for the TCXO

作　　者：吴佳[1] 林长龙[1] 郭振义[1] 李国峰[1] 

机构地区：[1]南开大学IC设计与系统集成实验室,天津300071

出　　处：《半导体技术》2016年第5期357-361,共5页Semiconductor Technology

摘　　要：提出了一种用于温度补偿晶体振荡器（TCXO）的三次方函数补偿电路。传统的用于TCXO的三次方函数补偿电路一般由4组对称的金属氧化物半导体（MOS）管差分对构成,补偿精度约为±1.5×10-6且补偿温度范围较窄。使用7组MOS管差分对设计了一款高精度的三次方函数发生器,补偿精度显著提高且性能更加稳定。用相似的方法构造四次方和五次方函数发生器,累加输出结果用于补偿由于温度变化而导致的晶体频率偏移,此方法可将补偿精度控制在±0.5×10-6且补偿温度范围扩大至-40~85℃,具有极高的应用价值。A cubic function compensation circuit for a temperature compensated crystal oscillator（ TCXO） was presented. The traditional cubic function compensation circuit for the TCXO generally consists of four groups symmetrical MOS transistor differential pair configuration,the compensation accuracy is about ± 1. 5 × 10- 6and the compensated temperature range is narrow. A cubic function generator with high accuracy was designed by an innovative use of seven sets of MOS transistor differential pair.The compensation accuracy was improved observably and the performance was more stable. The fourth and the fifth power function generators were constructed using the similar method. The cumulative output was used to compensate the crystal frequency shift caused by temperature changes. By this method the compensation accuracy can be controlled within ± 0. 5 × 10- 6,and the range of the compensation temperature extended from- 40 ℃ to 85 ℃,which has a high application value.

关 键 词：温度补偿晶体振荡器(TCXO) 补偿精度 补偿温度 三次方函数 晶体振荡器 

分 类 号：TN433[电子电信—微电子学与固体电子学]