利用ispLSI1032和DDS芯片AD7008实现的数字信号发生器  

The realization of direct digital signal source based on ispLSI1032 and DDS chip AD7008

作　　者：康中尉[1] 罗飞路[1] 陈棣湘[1] 

机构地区：[1]长沙市国防科技大学机电工程与自动化学院,长沙410073

出　　处：《电测与仪表》2004年第3期44-47,共4页Electrical Measurement & Instrumentation

摘　　要：介绍了利用Lattice公司的ispLSI1032E芯片和DDS频率合成器AD7008构成的数字信号发生器,它可以任意设置信号的起始频率、终止频率、信号幅值以及信号在每个频率保持的时间,系统自动地以一定的频率步进量完成频率变换。当频率改变时,不会影响波形的连续性,也不会造成相位的突变,真正地实现了频率的线性连续变化。This paper introduces a signal digital generator,which was made up of ispLSI1032 and DDS chip AD7008.Starting frequency,stopping frequency,span of frequency,and sweeping time of the signal can be set by it freely.The amplitude and phase of signal aren't affected by the change of sweeping frequency signal.The signal changes evenly when its frequency changes.The application of the signal source in the system of ACFM based on the sweping frequency method is achieved successfully,and the sizing of crack depth measurement is realized.

关 键 词：直接数字合成 频率扫描 ISPLSI 交变磁场测量 DDS 数字信号发生器 

分 类 号：TN74[电子电信—电路与系统]