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How does a Gilbert cell drive polyphase filter?

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pugongying

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output impedance polyphase filter

The Gilbert mixer has resistor load.(400ohm)
Does the polyphase filter affect the linearity of the mixer?
does the polyphase filter requires a low output impedance buffer?
 

rfsystem

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Could you answer how you build up the polyphase filter? Is it active or passive? For low IF or radio frequency?
 

pugongying

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passive RC polyphase filter

low-IF, IF=4MHz,signal BW=2MHz

Thx
 

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