Loop Filter Poles and Zeros

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Engineer4ever

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Hi,

How can I determine the formula of poles and zero for that filter? I am a little confused.

Thanks in advance,
 

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Are you sure that there is no resistance or such between D0 & C1 or VCO
 

Poles and zeros are derived from the transfer function in the s-domain.
Thus, you need the output-to-input ratio.
What is your input? I assume it is a current - correct?
 

This is a loop filter used in the PLL loop. The input is current and the output is the control voltage of the VCO
 

Engineer4ever said:
This is a loop filter used in the PLL loop. The input is current and the output is the control voltage of the VCO
Click to expand...

Yes - that`s what I have expected.
As said - derive the transfer function Vout/Iin and determine poles and zeros. This shouldn`t be too much work.
 

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