PLL Jitter, PhaseNoise cadence 仿真

im2058

之前看了一些PLL phasenoise，jitter仿真的东西，很多东西看了后，都一知半解的。关于pll的phaseNoise仿真，很多地方也都没有特别指明怎么导出，导出单位是什么。
在花时间看完后，就系统性整理了个详细文档，希望对后面人有帮助

同时，如果发现哪边错误，欢迎大家指正，讨论。

im2058

thomas9211 发表于 2024-4-3 22:59
Why is a charge pump using DSB instead of SSB?

Good catch!!
Checked some Keysight's materials before,  we know PhaseNoise is measured based on SSB in most equipment.  


It should be using SSB here.

Why using DSB in this material is that we don't know which one(DSB or SSB) should be used initially.  So we chose the DSB for more worst consideration.
Will Updated this materials in next Version.

im2058

david_reg 发表于 2024-4-4 18:27
Thanks for the detail sharing.
I am just studying the PLL simulation these days. Here are another ...

Thanks for the detail sharing.
I am just studying the PLL simulation these days. Here are another two comments for discussion:

1. in P19, the spectre noise analysis result of LPF will only give one-sided PSD Sn(f), when it is used in PLL phase domain model simulation for phase noise estimation, I think two-sided PSD i.e. Sn(f)/2 should be used.
Comments: Actually, I'm not very sure that the noise type spectre gives is SSB or DSB. I try to find it in Cadence help doc, but failed to find it(if possible, can you tell where you see it).  So I just use the raw data. (Another one is that Sn(f)/2 or Sn(f)*2, typo here??).


2. in P38, the "Direct plot form" function of sampled pnoise

    "Output Noise": I think this is the DSB noise voltage PSD Sv(f) (V^2/Hz) at the cross point;
    "Edge Phase Noise" I think this is the SSB phase noise PSD Sp(f) (dBc/Hz) at the cross point;
    their relationship is
     Sp(f) (dBc/Hz) = 10*log10(Sv(f)/2*(2*pi*f0/SR)^2)
   where f0 is the PSS fund, SR is the slew rate at the cross point.

Comments: If possible, can you tell where you see this equation? I can try to use your equation to do a correlation later.

lzzeng

学习学习

1261015620

简单翻了下，很详细，有时间仔细学习下，感谢楼主分享！！！

lpl_bys

感谢分享

tch56

感谢分享

li_jingwen

谢谢分享！

hzq710789790

感谢分享

sutaotao2001

Thanks

ac1ac

感谢大佬分享

waley

3q for share~