用于温湿度信号采集的Σ-△型ADC的设计与实现  

Design and Realization of Σ-△ ADC for Temperature and Humidity Signals Acquisition

作　　者：程敏 王德寿[1] 习友宝[1] CHENG Min WANG De-shou XI You-bao(School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China)

机构地区：[1]电子科技大学电子工程学院

出　　处：《测控技术》2017年第10期37-41,共5页Measurement & Control Technology

摘　　要：为实现室内育种多通道温湿度的信号采集,采用基于过采样原理的∑-△模数转换器(ADC)及FPGA的方案更为方便简单。针对温湿度采集的低成本、低精度要求,选择了由FPGA的低压差分输入端(LVDS)及其内部的抽取型级联积分梳状(CIC)滤波器实现的一阶ADC。该ADC分辨率达到12位,转换时间约为350μs,温湿度测量精度完全满足同类型系统指标要求,可作慢信号采集的通用ADC。通过ChipScope在线调试和改进调理电路,使得测量误差进一步减小。还可采用高阶ADC满足高精度多种类模拟信号测量,具有适用性强、成本低、功耗低,且集成度高等特点。It is more convenient for FPGA-based systems to the realization of a multi-channel temperature and humidity use ∑-△ ADC based on oversampling principle, for signal acquisition system in an incubation room. To meet the low cost and low precision requirements of temperature and humidity acquision, the system chooses a first-order ADC, consisting of a low-voltage differential signaling（LVDS） and a cascaded integrator-comb（CIC） filter. The ADC resolution is 12-bit and its conversion time is about 350 p,s, so it can be used as a slow signal acquisition universal ADC with accuracy meeting the same type of system indicators. Through ChipScope on- line debugging and improving the conditioning circuit, the measurement error is further reduced. A high-order ADC can be used to meet the requirement of high-precision multi-class data measurement. The system has the characteristics of strong applicability, low cost, low power consumotion and high inte^Tation.

关 键 词：过采样原理 FPGA ∑-△模数转换器 多通道数据采集 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置]