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system IIP2 (second order intermodulation distortion)

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eng-a-hesham

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in the phase of receiver's system design (system specifications extraction) i've evaluated the wanted IIP3 as

IIP3=(3Pin-Pim3)/2

Pim3=10log(K.T.B)+NF (B -> bandwidth)

but now i cant find a method to get IIP2 ??! any ideas !!! :?:
 

IP2_and_IP3.gif

Reference:
<Accurate and Rapid Measurement of IP2 and IP3> https://www.designers-guide.org/analysis/intercept-point.pdf
 

i think this method can be done only after having a system model because the equation variables values can only be obtained from simulation ( measurements phase) .. but now i'm obtaining the system specifications from the standard and this method will not work with me .. !!
 

So the 2nd order products typically show up at baseband (f1-f2) or at the 2nd harmonic. You need to look at the system requirements. For a superset receiver, generally 2nd iip doesn't cause a problem because bothe of these are filtered out. For a direct conversion receiver design, you need to look at dc offset requirements for the arc.

Dave
 
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