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Question about the function of caps in this gm-c filter

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liletian

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Hi Guys
In the attached pic, the two filters are suppused to be the same. One uses gm-c gyrator to replace big inductor in another pic. What are the four cap in the elleptical circles corresponds to?
I was thinking they correspond to the cap 1.23p and 3.29 p in passive filter. But why do you need four of them?
It is a IF filter in GPS application? Can anyone comments on it?
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hock

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Re: gm-c filter question

where is the attachment?
hock
 

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