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LMX2594: RFOUTA波形问题

Part Number: LMX2594

您好,我在使用LMX2594芯片遇到波形不对的问题,输入给oscin的波形为250MHz时钟,配置寄存器RFOUTA输出2.5GHz时钟,波形以及FFT频谱如下:

 请问为什么会在5GHz处出现近2dbm的波形,请问应该如何消除?