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How down-conversion mixer IIP3 influnce the receiver linearity?

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fenglingke

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Dear all,
I work for a RF receiver system design now. I need define RF down-conversion mixer parameter and circuit that mixer following LNA. One of RF mixer circuit performance is Gain=3dB ,IIP3=9dBm OIP3=12dBm; another circuits RF mixer performance is Gain=10dB ,IIP3=2dBm OIP3=12dBm.From reduce the receiver NF, i could choose the second RF down-conversion mixer circuit. I know 1/OIP3=1/OIP3+G1/OIP2+......,
but I confuse with how RF down-conversion mixer IIP3 influnce the linearity of system?
or how define the IIP3 base on receiver performanc?
could someone tell me? thanks
 

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