基于DDS与AGC的频谱分析仪设计  

The design of spectrum analyzer based on DDS and AGC

作　　者：林俊武[1] 洪海莲[1] 饶连周[1] 

机构地区：[1]三明学院机电工程学院,福建三明365004

出　　处：《延边大学学报（自然科学版）》2017年第1期74-77,共4页Journal of Yanbian University（Natural Science Edition）

基　　金：福建省教育厅资助项目(JA12305);国家自然科学基金资助项目(51601104)

摘　　要：为了提高信号测量频率范围及实现小信号频谱的测量,采用超外差式原理,结合DDS与AGC设计了一款简易的频谱分析仪,该频谱分析仪可以测量频率范围为1~30MHz、幅度为0.02~2V信号的频谱.经实测表明,该频谱分析仪具有测量精度高、测量带宽大、成本低和便捷等优点,具有良好的实用价值.In order to improve the measurement frequency range of the signal and measure the spectrum of small signal, a simple spectrum analyzer is designed based on DDS and AGC with the super heterodyne principle. The spectrum analyzer can measure the spectrum of signal with the frequency range from 1 MHz to 30 MHz, and can measure the spectrum of signal with amplitude from 20 mV to 2 V. The results of test show that the spectrum analyzer has the advantages of high measurement precision, wide measurement bandwidth, low cost and convenient, so it has good practical value.

关 键 词：频谱分析仪 DDS AGC 超外差式 

分 类 号：TP216[自动化与计算机技术—检测技术与自动化装置]