数字中频正交采样及其FPGA实现

为满足高性能信号处理的要求，需要直接对中频信号进 行采样得 到正交的两路信号。分析了直接中频正交采样的基本原理，给出了其中最重要的滤波器设计 思想及其在FPGA上的硬件实现方法，并仿真验证该方法的有效性。理论分析和实验结果表明 ，这一方法可以满足高性能信号处理的要求。

Digital quadrature sampling of IF signal and its FPGA implementation

To satisfy the requirement of high performance signal processing technique, it i s necessary to use the direct sampling of IF(Intermediate Frequency) signal to o btain quadrature signals. This paper analyses the principle of the quadrature sampling of IF signal,presents the meth od to design the filter and its FPGA implementation,and finally,validates the ef fectiveless of this method through a simulation.Theorectical analysis and simul ation result demonstrate that the requirement of high performance signal processing technique can be completely satisfied with this methods.