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PLL loop filter design?

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Danis

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I am looking for the loop filter design calculations for a synthesized RX at **broken link removed**
The receiver uses the MC145170-2 and the filter used is type2 3rd order which is not included in the datasheet of MC145170 for design. The filter constitutes R16, C18, C19, R17 and C15. An additional R15 resistor of 3.3k is also included from the PDout (pin 13) of MC145170, the purpose of which I am unable to understand.

Any help will be appreciated!
 

Nobody know???

Is this the right place to post this message?
 

i think you 'd better draw the circuit, ok?
and you can calculate the transfer function from the current of cp to the control voltage vctrl . good luck!
 

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