基于交流反馈的电容式加速度计闭环数字系统  

Capacitive Accelerometer Closed-loop Digital System Based on AC Feedback

作　　者：汤浙 丁徐锴 黄丽斌[1,2] TANG Zhe;DING Xukai;HUANG Libin(School of Instrument Science and Engineering,Southeast University;Key Laboratory of Micro-Inertial Instrument and Advanced Navigation Technology of Ministry of Education,Southeast University)

机构地区：[1]东南大学仪器科学与工程学院 [2]东南大学微惯性仪表与先进导航技术教育部重点实验室

出　　处：《仪表技术与传感器》2024年第10期27-31,50,共6页Instrument Technique and Sensor

摘　　要：针对加速度计系统中普遍存在的信号零偏漂移与低频噪声,文中采用一种基于交流反馈的闭环系统,结合结构参数和电路参数,对加速度计系统进行仿真,设计FPGA数字电路。搭建模拟直流反馈与数字交流反馈的闭环系统测试平台,在相同环境下进行对比实验。实验结果表明:交流反馈相较于直流反馈信号输出零偏稳定性与噪声水平改善约45%,产生了较好的效果。In this paper,a closed-loop system based on AC feedback was proposed to address the common challenges of signal zero deviation drift and low-frequency noise in accelerometer systems.The accelerometer system was simulated by integrating accelerometer parameters and circuit parameters,and it was implemented using FPGA digital circuits.A closed-loop system test platform for simulation DC feedback and digital AC feedback was constructed,followed by conducting comparative experiments under identical environmental conditions.The experimental results indicate that the output zero bias stability and noise level of the AC feedback signal are improved by about 45%compared with that of the DC feedback signal,producing good effect.

关 键 词：微加速度计 闭环系统 交流反馈 噪声水平 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TH824[自动化与计算机技术—控制科学与工程]