To improve IRRs of the system, two modules, RF filter and polyphase filter before the second downconersion, are added to the single-double quadrature structure.
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- 为提高系统的镜像抑制性能,射频前端在单双正交结构的基础上添加两个模块:射频滤波器与第二次混频之前的多相滤波器。