基于伪插值的信号源幅频特性补偿方法研究  

A method for amplitude-frequency characteristic compensation of signal generator based on pseudo interleaving

作　　者：刘科[1] 田书林[1] 肖寅东[1] 

机构地区：[1]电子科技大学自动化工程学院,成都610054

出　　处：《电子测量与仪器学报》2009年第7期12-16,共5页Journal of Electronic Measurement and Instrumentation

基　　金：国家自然科学基金(编号:60772145)资助项目;新世纪优秀人才支持计划(编号:NCET-06-0808)资助项目

摘　　要：为了提高信号源的采样频率,伪插值方法被用来完成数模转换器采样频率的倍频。但由于受数模转换器(DAC)零阶保持特性以及信号源输出通道元器件值的影响,输出的信号幅频衰减较为严重。针对信号发生器中的这一常见问题展开研究,从理论上对伪插值信号发生器的幅频特性进行了分析,提出了基于FIR滤波器的幅频校正方法,并对设计结果进行仿真对比,证明了该方法的可行性。最后,通过在500MSPS任意波形发生器中应用,证明了该方法能有效的补偿伪插值过程中由于DAC零阶保持、通道非线性所造成的幅频特性不平坦,精度高,重复性好,具有较高的工程应用价值。In order to increase the sampling rate of signal generator, the pseudo interleaving method is used. As a result of the zero-order hold of digital-to-analog converter（DAC） and the component value distortion of signal condition circuit, the frequency response of signal generator using pseudo interleaving isn＇t flat seriously. Aiming at the frequency response of signal generator, at first, the spectrum of pseudo interleaving signal generator is analyzed, then, the com- pensation method based on FIR filter is put forward and the simulation results are compared. At last, the method is ap- plied in AWG with sampling rate 500MPS, and the results show that the amplitude-frequency character, which is influ- enced by zero-order hold of DAC and non-linear of signal condition circuit, is well compensated.

关 键 词：直接数字合成 信号发生器 伪插值 FIR滤波器 幅频特性 

分 类 号：TP335[自动化与计算机技术—计算机系统结构]