vco杂散问题

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VCO是否有必要仿杂散？是通过输出频谱看吗？自己尝试放了下，结果如图，根据图片是否可以说杂散抑制为-49dB?(中心频率为6.4GHz，三次谐波处杂散最大）这种VCO的杂散性能算是正常的吗？希望大家指教一下，谢谢！！

MustafaSami

Hello, Third harmonic rejection of about 49dB is pretty good

but try to simulate the effect of having a very small (100mV peak-to-peakm 50MHz) sinewave imposed on the VDD supply.
Do this simulation and see its effect on your output spectrum

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MustafaSami 发表于 2020-12-20 13:45
Hello, Third harmonic rejection of about 49dB is pretty good

but try to simulate the effect of hav ...

thank you! Very good advice.

a104842708

你那个叫harmonic，不叫杂散吧

l13787908861

路过学习，很实用，谢谢分享。

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a104842708 发表于 2020-12-22 13:16
你那个叫harmonic，不叫杂散吧

VCO的杂散抑制定义不是载波和最大谐波的差值吗？对这些称呼确实不是很明确，麻烦指教，谢谢！