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如何 降低TRF372017 的相位噪声

Other Parts Discussed in Thread: TRF372017

如题,

频率1.4G的时候,相燥为  3左右
                   现在频率改成1.8G的以后,相燥为4.5左右,大了很多,这样的话,整机指标就过不了   《5%
       请帮我们分析一下,改进哪里的配置,能把TRF372017芯片 的相位噪声降低?