一种提高数模混合信号测试精度的算法  

An Algorithm on Increasing Digit-analog Mixed Signal Test Precision

作　　者：陈卫[1] 周亚丽[1] 

机构地区：[1]中国电子科技集团公司第58研究所,江苏无锡214035

出　　处：《电子与封装》2011年第9期8-10,共3页Electronics & Packaging

摘　　要：文中论述了一种提高数模混合信号测试(基于DSP信号处理)精度的算法(以下称旋转数据算法),旋转数据算法是针对数模混合信号测试中异步采样的不连续性导致的频谱泄漏问题,而提出的消除频谱泄漏的算法。旋转数据算法的主要思想是:把数模混合电路的测试信号等效地看成由一个旋转向量在X轴上投影产生,当采样不连续时,采样数据经FFT变换后会产生频谱泄漏。通过适当地旋转向量,使不连续的采样连续,再利用这个向量旋转相位去修正采样数据,这样就解决了频谱泄漏问题。文中用VB程序实现了此算法,并讨论了在数模混合信号动态测试(SFDR、SNR、THD)中的应用。This paper describes an algorithm which can improve digit-analog mixed signals test precision based on DSP process （called rotated data algorithm below） . The algorithm sloves spectrum leakage problem which noncontiguous of asynchronous sampling produces in mixed signal test. The main ideal of the rotated data algorithm is that the test signal of the digit analog mixed circuit is produced equivalent by a rotating vector＇s projection at X axis. When sampling non countiuously, sampled data which is transform by FFT will produces spectrum leakage. Non countiuously Sampled data becomes continuous by rotating equivalent vector properly. Then we slove spectrum leakage problem with sampled data corrected by the rotating vector＇s phase. The paper realizes the algorithm by VB program, and discusses the application of the algorithm in mixed signal test, such as SFDR, SNR and THD.

关 键 词：数模混合信号测试 旋转数据算法 FFT DSP信号处理 SFDR 

分 类 号：TN407[电子电信—微电子学与固体电子学]