What does filter influence in PLL (especially CD4046)?

[Elits]

Filter in PLL CD4046??

Hi all,
i want to know, What does filter influence in PLL especially CD4046? Can we configure it freely or there is the rule to configurate? what is the diferences between Frequency Lock (FL)and Frequency capture(FC)? is FC always bigger than FL?
Thanks

Regards,
elits

 

[IanP]

Re: Filter in PLL CD4046??

Filter design in any PLL system is very important ..
Here you will find detailed desription (including several examples) on how to design LPF filters using 4046 ICs:
"Filter Design for the HC/HCT4046A"
http://www.etc.tuiasi.ro/cin/Downloads/pll/PLL-4046.pdf

Regards,
IanP

 

[Miguel Gaspar]

Filter in PLL CD4046??

Well, if you do a wide bandwith the PLL will have a wide bandwith but a slow response. But if your filter bandwith is narrow, the pll will have a narrow bandwidth and a fast response.

For the CD4046 has a software, you can find in this forum.

 

[jjohn]

Filter in PLL CD4046??

Without filter in PLL,,, I doubt it will work device like 4046....