摘要
抑制电磁干扰是解决光纤陀螺尤其是轻小型光纤陀螺低速灵敏度的关键问题,为了从电源完整性角度研究光纤陀螺检测电路干扰传导特性,需要对光电探测组件的电源抑制比进行测试。针对光纤陀螺微弱信号检测的特点,提出一种基于锁相放大器的光电探测组件电源抑制比测试方案,通过测量普通运算放大器的电源抑制比并与手册给定的典型值进行对比,校验了测试系统的准确性。以中低精度光纤陀螺调制-解调频率范围为例,利用该测试系统测量了光电探测组件100 k Hz^3 MHz内电源抑制比频率特性曲线。实验结果表明,光电探测组件的电源抑制比呈明显的高通特性,在100 k Hz频率点处+PSRR约为29.5 d B,到达3 MHz处衰减为17.8 d B,为后续计算电源传导干扰抑制要求和优化电源退耦网络提供了依据。
The suppression of electromagnetic interference is a key issue in solving the low-speed sensitivity of fiber optic gyroscope（FOG）, especially for light and small FOGs. In order to study the interference and conduction characteristics of FOG from the point of view of power integrity, it is necessary to test the power supply rejection ratio（PSRR） of the PIN-FET module. Aiming at the weak signal detection of FOG, a power supply rejection ratio test scheme based on lock-in amplifier was proposed. The accuracy of the test system was verified by measuring the power supply rejection ratio of a normal operational amplifier and comparing it with the typical value given in official datasheet. Taking the modulation-demodulation frequency range of medium and low precision FOGs as an example, the PSRR frequency characteristic curve of the PIN-FET module in 100 k Hz-3 MHz was measured by this test system. The experimental results show that the PSRR of the PIN-FET module has obvious high-pass characteristic, the ＋PSRR at the frequency of 100 k Hz is about 29.5 d B, and the attenuation reaches 17.8 d B at the frequency of 3 MHz, which provides a basis for the suppression of power conduction interference and the optimization of the decoupling network.
作者
潘雄
宋舒雯
张少博
王磊
宋凝芳
PAN Xiong;SONG Shuwen;ZHANG Shaobo;WANG Lei;SONG Ningfang(School of Instrumentation Science and Opto-Electronics Engineering, Beihang University, Beijing 100191, China)
出处
《中国惯性技术学报》
EI
CSCD
北大核心
2018年第1期76-80,共5页
Journal of Chinese Inertial Technology
基金
国家自然科学基金(61575013)
关键词
电源完整性
电源抑制比
锁相放大
光电探测组件
光纤陀螺
power integrity
power supply rejection ratio
lock-in amplification
PIN-FET module
fiber optic gyro
