PLL锁定电压有周期性衰减现象

lineader · 发表于 2024-6-15 22:35:19

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各位大佬，请问我的PLL锁定后，锁定电压有周期性衰减的现象，周期约0.6MH，PLL的带宽为2.5MHz。请问这种现象是什么原因造成的？

thomas9211 · 发表于 2024-6-16 00:08:55

I guess the pharse margin is less than 30 degrees.
Adjust the phase margin to 60 degrees will prevent this phenomenon.

yhnwx · 发表于 2024-7-10 13:17:55

第二张图，PLL相位裕度明显不够，系统不稳定

eda_dude · 发表于 2024-7-10 14:04:06

Definitely pll loop phase margin issue

lineader · 发表于 2024-7-17 10:38:30

thomas9211 发表于 2024-6-16 00:08
I guess the pharse margin is less than 30 degrees.
Adjust the phase margin to 60 degrees will preven ...

Thank you for your answer, it's really a matter of phase margin！

lineader · 发表于 2024-7-17 10:39:39

yhnwx 发表于 2024-7-10 13:17
第二张图，PLL相位裕度明显不够，系统不稳定

谢谢您的回答，确实是相位裕度的问题

lineader · 发表于 2024-7-17 10:43:17

eda_dude 发表于 2024-7-10 14:04
Definitely pll loop phase margin issue

Thank you for your answer, it's really a matter of phase margin！

qingtianxiaojia · 发表于 2024-7-26 11:50:20

看看~~

[求助] PLL锁定电压有周期性衰减现象