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关于LMX2592芯片的相位噪声问题

Other Parts Discussed in Thread: LMX2592

我所在公司买了一块LMX2592的demo板,在测试时发现输出信号为3GHz(6GHz/2)时,相位噪声为-137dBc/Hz(数据手册是-140dBc/Hz@1MHz);

输出信号为6GHz时,相位噪声为-128dBc/Hz(数据手册是-134dBc/Hz@1MHz);而且demo板接地不好时,近端有类似振荡的情况。