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LMX2572EVM: 整数边界杂散

Part Number: LMX2572EVM
Other Parts Discussed in Thread: LMX2572

  在测试评估版时,不同频率下整数边界杂散差别很大。

下表是100M鉴相频率下,偏离1M的杂散抑制:

频率 3201 3301 3401 3501 3601 3701 3801 3901 4001
杂散 -55dBc -48dBc -53dBc -50dBc -55dBc -46dBc -69dBc -65dBc -70dBc

在基频输出3200~3700M时,杂散抑制很差,其余3800~6400M都能满足65dBc抑制,这是器件本身问题还是数据配置问题?