what is difference between IP3in and IP3out?

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ip3out ads

In @DS, we know that IP3in=IP3out-Gain , I don't kown what's the difference between them , and which is more important for circiut?? thank you.
 

They are just ways to signify the equivalent distortion levels at different parts of a system. Manufacturers claim the best numbers for their products. Ones with gain have the output parameter, ones with losses like passive mixers have the input parameter.
 

IIP3 and OIP3 are just linearity measures that tell you the power levels as to when third order components (unwanted) are equal to your wanted signal.
 

hi all,how i calculate IP3in and IP3out in ads2003
regards
 

The difference is that for a given IP3 , you have some input power X (Port1), and you
have some output Power Y(Port2). Now how do you want to look at it?

If it's a RX for a SoC and you can't measure Pout directly you might want
to use IIP3, because you can directly measure Pin!

If it's a TX the it would be more useful to use to use OIP3.

And yes OIP3=IIP3+G

Hope this helps.
 

the theory of IIP3 is described in detail by Thomas H lee,the design of CMOS RFIC, in chapter 11.
hope you all benefit.
 

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