中频正交采样的设计与实现结果

Quadrature Sampling of IF Signal:Design and Realizing Results

为满足高性能信号处理技术要求，需要直接对中频信号进行采样来得到正交双路信号。设计了基于数字乘积检波器的中频正交采样系统的方案，采用ＩＭＯＳＡ１００来实现电路，并对实现结果进行了测试。文章还讨论了具体实现中的几个重要问题与现象，并与常规正交双路采样电路进行了对比分析。实验结果表明，数字中频正交采样完全可以满足高性能信号处理技术的要求。

To satisfy the requirement of high performance signal processing technique,it is demanded to use the direct sampling of IF signal to get quadrature signals.The scheme based on digital product detector is given in the paper.The circuit is realized using IMOS A100 and the re-sults are tested.Several important problems to realization are discussed and compared with usual quadrature sampling circuits.It is indicated by the testing results that the requirement of high per-formanee signal processing technique can be completely satisfied by digital sampling of IF signal.