PLL Jitter, PhaseNoise cadence 仿真

MasakaZ

好东西，我也有这种疑惑

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.

skahill

Good, thanks

chungming

THANKS!!

david_reg

im2058 发表于 2024-4-4 10:17
Good catch!!
Checked some Keysight's materials before,  we know PhaseNoise is measured based on S ...

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.
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.

amigo.change

im2058

zhangyp 发表于 2024-4-3 15:22
你好，能给一个具体的电路给我仿真参考吗，就是你现在仿真的这个电路，能打个包发一下吗？十分感谢 ...

不好意思，公司服务器里无法拷出。

南方本科生

Thx for sharing!

zxkl317408

多谢分析

cdting

Thanks!!!