一款高精度90°移相器实用电路的设计  

The Design of A High-precision 90° Phase Shifter Circuit

作　　者：郑振宇[1] 晋芳[1] 鲁永康[1] 

机构地区：[1]中国地质大学机械与电子信息学院,武汉430074

出　　处：《电测与仪表》2012年第2期84-86,共3页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(41004079);中央高校基本业务费专项资金资助项目(GUG090107)

摘　　要：用RC元件及相应电路设计低频固定频率90°±Δφ移相器是人们常用的方案,然而RC移相器元件的老化、环境(尤其是温度)的变化严重地影响了移相器的稳定性。本文采用了一系列措施:(1)选用低温度系数的精密阻容元件;(2)对阻容元件进行老化处理;(3)分别测量元件的温度系数;(4)用相反温度系数的阻容元件按一定的比例进行补偿等,使RC元件温度系数达到±1ppm/℃以内。对90°±Δφ移相器的温度试验表明,电路的温度系数达到2.88ppm/℃。文中还给出所选用的部分国内外RC元件实测的温度系数,对读者利用RC元件设计某些高稳定性电路(如HPF、BPF、LPF等)有重要的参考价值。With the RC components and the corresponding circuit design low-frequency fixed frequency 90°＋△φ phase shifter is commonly used scheme, however, aging condition and environment （especially temperature） changes of RC phase shifter components seriously influenced the stability of phase Shifter. This paper adopted a series of measures： （1） low temperature coefficient precision components; （2） aging treatment to componets; （3） temperature coefficient measured components; （4） resistance temperature coefficient with opposite according to certain proportion components, so as to make RC compensate temperature coefficient within ±1ppm/℃. The temperature testing of 90°＋ △φ phase shifter showed that the temperature Coefficient of the circuit reached 2.88ppm/℃. This paper also gave the selected part of RC components measured at home and abroad for temperature coefficient, which have an important reference value to readers using RC component design some high stability circuit （such as HPF,BPF,LPF etc）.

关 键 词：微弱信号 90°移相器 高精度 温度系数 RC元件 

分 类 号：TN710[电子电信—电路与系统]