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AFE7071 RF输出0.5*LO and 1.5*LO frequency处异常噪声.咨询

user4759499
Prodigy 101 points
Other Parts Discussed in Thread: AFE7071, LMX2581, AFE7070EVM

你好，想咨询下AFE7071问题,现做一款QAM调制器采用AFE7071.

      LO采用LMX2581,实测输出指标很好.

       给AFE7071  QAM调制信号,sample rate  64Mhz,baseband signal bandwidth is 8Mhz. DVB-C standard. 信号非常干净.

      经过AFE7071调制输出0.5*LO and 1.5*LO frequency处有很强异常噪声.

      已使用AFE7070EVM测试,现象一致.

      已尝试LO各种频率以及输出功率，现象也一样，如图：

     可否给些建议，谢谢！