一种新的应用于锁相放大器的数字相关电路结构设计  

A New Design of Digital Correlation Circuit Applied in Lock-in Amplifier

作　　者：吴明华[1] 郑刚[1] 江斌[2] 李孟超[1] 陈璐玲[1] 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093 [2]上海电缆研究所,上海200093

出　　处：《计算机测量与控制》2010年第12期2824-2826,共3页Computer Measurement &Control

基　　金：国家自然科学基金资助项目(60472023)

摘　　要：为了解决数字锁相放大器在进行数字相关运算中引发的大存储量和大运算问题,首次将电压/频率转换方法引入锁相检测电路中,采用了一种新的数字相关电路结构,极大降低了数字相关运算对处理器高性能的要求;理论分析与实验表明:该数字锁相放大器性价比高、测量响应时间快,在对1mV信号进行测试中,相对误差能够控制在1%以内。In order to solve the problem of a mass of operational data caused by correlation operation in digital lock-in amplifier（DLIA）,for the first time,the Voltage-to-frequency converting（V/F） method was taken into LIA detecting circuit,In this paper,a new type of correlation circuits structure is presented,reduces the demands of processor performance which is using for correlation operation.It＇s theoretically analyzed and proved through experiment that this DLIA is good in costs and measuring response time,relative error of DLIA can be controlled within 1% by which measures 1mV signals.

关 键 词：数字相关电路 锁相放大器 压/频转换 微弱信号 

分 类 号：TN911.23[电子电信—通信与信息系统]