PLL no lock

Poky Poky

2011 7 11

0 个回答

10 次查看（30 天）

0 个投票

Hello everyone,

I made a simple PLL simulink model (link bellow). When the reference frequency is 2010Hz and the VCO is nominally at 2000Hz, the PLL locks successfully. However when the reference is 2020Hz (or more) the PLL does not lock but oscillates. I tried varying several of the model parameters but still no clue why this is so? Any idea or explanation would be appreciated.

http://www.sendspace.com/file/dddy8s

Greetings, PO

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Poky Poky 2011-7-14

No ideas? OK I went a little bit further and figured out that actually the loop filter should be a first order. Then everything with the lock range is as expected. Does anyone has an idea why the loop filter needs to be first order? I am new to this stuff, so simple explanation would be greatly appreciated.

Greeting,PO

请先登录，再进行评论。

请先登录，再回答此问题。

Follow Question