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How to design an active loop filter for PLL
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dicket



Joined: 04 Jun 2004
Posts: 23
Post01 Jan 2007 4:03   

active loop filter
I have two questions:
First,when I have known loop badwidth and phase margin,how to determin the components values?how to get an expression of the loop filter transfunction?
Second,how to select the OP-amp?what role does the op-amp play?what effect on PLL performance does the parameters such as INPUT RAIL,OUTRAIL and SLEW RATE make?
Thanks.
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dicket



Joined: 04 Jun 2004
Posts: 23
Post03 Jan 2007 6:09   

active loop filter design
For a fourth order active loop filter,How to determinate the value of C3 R3 C4 R4the higher stage of the filter?
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dicket



Joined: 04 Jun 2004
Posts: 23
Post07 Jan 2007 8:54   

active filter pll
Hi,for the fourth order active loop filter shown below, how to calculate the value of C3 , R3, R4? In the book ‘PLL Performance, Simulation, and Design 3rd Edition’ written by Dean Banerjee, it gives that C3=C4*4T3*T4/(T3-T4)^2 ,R3=(T3+T4)/(2*C4) , R3=(T3+T4)/[2*(C3-C4)],but I do not know how to get these formulas. Could you give me some guide or help?
Thanks.

Added after 7 minutes:

How to design an active loop filter for PLL
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ptoo



Joined: 10 Apr 2008
Posts: 1
Post16 May 2008 16:46   

pll active filter
please reffer to
http://www.aubraux.com/design/pll-design-tool.php
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Post16 May 2008 16:46   

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northeast1



Joined: 21 Jun 2007
Posts: 152
Helped: 4
Post20 May 2008 8:25   

pll active loop filter
dicket wrote:
I have two questions:
First,when I have known loop badwidth and phase margin,how to determin the components values?how to get an expression of the loop filter transfunction?
Second,how to select the OP-amp?what role does the op-amp play?what effect on PLL performance does the parameters such as INPUT RAIL,OUTRAIL and SLEW RATE make?
Thanks.


If you design this active filter for PLL, please care about the OP poles, this will influence the PLL own poles and zeros.
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LvW



Joined: 07 May 2008
Posts: 1466
Helped: 242
Location: Germany
Post20 May 2008 8:46   

pll active loop filter design
Yes, normally the opamp poles will have an influence of 1% or even smaller.
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joe_chen



Joined: 03 Oct 2007
Posts: 58
Helped: 2
Post05 Jun 2008 17:10   

active loop filters
note the nonlinear effect on the loop
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