一种宽动态范围数据采集系统的设计  

The Design of a Wide Dynamic Range Data Acquisition System

作　　者：孙丛君[1] 于龙[1] 张喜茂[1] 肖建[1] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《微计算机信息》2009年第4期90-91,136,共3页Control & Automation

摘　　要：本文介绍了一种基于浮点放大技术的宽动态范围数据采集系统。系统采用AT89S52作为核心控制器,采用12位A/D转换器AD574A,应用浮点放大技术,以低成本实现了120dB的大动态范围数据采样。由于采用硬件方式控制放大器的增益,放大倍数确定极快,并且采样过程中应用了流水线结构,实现了数据采集电路的流水线作业方式,因而系统不会因为增加了浮点放大电路而降低采样速度。文章详细介绍了系统的总体方案及部分硬件设计方案。In the paper, a wide dynamic： range data acquisition system using floating-point A/D conversion scheme is introduced. With the core of AT89S52, 12-bit converter AD574A, and the floating-point A/D conversion scheme the system＇s dynamic range can reach to 120dB with low-cost. Hardware applied to gain control makes the setting of the condition gain extremely fast. And the timing sequence overlapping technology used in the course of sample implements the pipelining of data acquisition system .So in this way the sampling speed of the system will not reduce for adding a floating-point amplifier. The paper introduces total scheme and hardware design of the system in detail.

关 键 词：数据采集 浮点放大 AD574A 

分 类 号：TP274[自动化与计算机技术—检测技术与自动化装置]