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LMX2594整数边界杂散问题

Other Parts Discussed in Thread: LMX2594

使用原厂开发板测试,100M晶振,200M鉴相时LMX2594整数边界杂散抑制较差,只有-40dBc左右抑制。

按照提示The purposes of adding
a multiplier is to reduce integer boundary spurs or to increase the phase detector frequency.

尝试用MULTIPLIER和预分频器改变鉴相频率,使整数边界杂散原理鉴相频率整数倍±5M以外,也未见改善。

此外,开发板在高频14-15GHz输出功率-3~-4dBm,测试比datasheet给的小6dB左右,不确定是否测试条件不太对。

设置如下: