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Help me to analyse this filter circuit ???

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hbaocr

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Please show me the role of Crystal 13.56Mhz.
Please help me to show the relation between Vin and vout!
thank you very much!
 

It is using the series resonance of the crystal to provide the notch. You could simulate it to find out the effect of the components but my guess is CQ is to remove the effect of the parallel resonance and RQ is to provide a limit to the depth of the notch and a broadening of the notch, otherwise it would be very deep and narrow.

Keith.
 
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    hbaocr

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This should give you a little insight into how to model a crystal.
**broken link removed**

You can probably get away with substituting it with a resonator for a 1st order approximation.
 
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