DDS集成运放测试仪研究与设计  

Design and research of parameter tester for integrated operational amplifier based on DDS sweep signal source

作　　者：杨春光[1] 刘海成[1] 邢敬娓[1] YANG Chungong LIU Haicheng XING Jingwei(College of Electrical and Information Engineering, H eilongjiang Institute of Technology, Harbin 150050,China)

机构地区：[1]黑龙江工程学院电气与信息工程学院,黑龙江哈尔滨150050

出　　处：《黑龙江工程学院学报》2017年第3期33-37,共5页Journal of Heilongjiang Institute of Technology

基　　金：哈尔滨市优秀学科带头人项目(2015RAXXJ036)

摘　　要：为了提高运放参数测试精度,保证选择运放元件准确性,设计一款以DDS为基础的集成运放测试仪。测试仪以ATmage16为控制核心,采用DDS扫频技术,通过设计的运放参数测量电路、峰值检波电路和人机接口电路等完成对运算放大器直流输入失调电压、输入失调电流、交流差模开环电压增益、交流共模抑制比等参数的测量和计算,应用闭环测试原理和二阶巴特沃斯低通滤波器技术,最后通过LCD显示结果。测试仪突破模拟合成法的原理,可以实现不同频率、相位的任意波形,并且各种参数均可通过编程实现,具有测量精度高、性价比高、操作简单、人机界面友好等特点。In order to improve the integrated operational amplifier parameters of the test accuracy,and guarantee the accuracy,aparameter tester for integrated operational amplifier based on DDS sweep signal source is designed.This tester,based on ATmage16,controls the core with DDS frequency sweep technique,through parametermeasuring circuit and peak detection circuit and man-machine interface circuit to measure and calculate DC input offset voltage,input offset current,AC differential mode open-loop voltage gain,the exchange of common mode rejection ratio and other parameters.It makes the application of closed loop testing principle and second-order butterworth low-pass filter technology,and the design selecting LCD as display unit.The tester,breaking through the simulation of the synthesis principle,can realize the arbitrary waveform of different frequency and phase,and various parameters can be realized by programming,which has the features of high accuracy,cost-effective,easy operation,friendly-interface and so on.

关 键 词：集成运算放大器 DDS 参数 测量电路 

分 类 号：TM932[电气工程—电力电子与电力传动]