摘要
为了满足大动态范围、高精度、低噪声地磁数据采集的发展需求,采用一种24位Σ-Δ型ADC7192用于三路数据采集的方法。该方法通过使用可编程增益阵列调理交流放大部分减小了整体电路规模和功耗。针对野外等特殊应用场所引入二次数字(模拟)电源、自校准、满量程校准和ADC内部滤波器,降低其噪声的同时又抑制了50 Hz工频干扰。后期硬件测试对采集数据进行了对比分析,功耗为4.35 m A、测量精度可达70μG的技术指标。
In order to meet the development requirements of large dynamic range,high precision and low noise data acquisition,a 24-bit sigma-delta ADC7192 is used for three-way data acquisition. The method by using the programmable gain array regulate AC amplifying section reduces the overall size and power consumption. For special applications like wild places introduced second digital analog power,self-calibration,full-scale calibration and ADC internal filter,its noise was reduced and the 50 Hz frequency interference was suppressed. The latter part of the hardware test on the collected data was analyzed and the power consumption obtained is 4.35 m A,measurement precision can reach70 μG for the technical indicators.
作者
刘志文
张晓明
马喜宏
LIU Zhiwen, ZHANG Xiaoming , MA Xihong(National Key laboratory for Electronic Measure Technology, Taiyuan 030051, Chin)
出处
《电子器件》
CAS
北大核心
2017年第5期1140-1144,共5页
Chinese Journal of Electron Devices
基金
国家自然科学基金项目(51375463)
关键词
数据采集
Σ-Δ型ADC
模数转换
高精度
低噪声
低功耗
data collection
sigma-delta ADC
analog to digital conversion
high precision
low noise
low power consumption
