what is difference between IP3in and IP3out?

[filtershaoyong]

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.

 

[flatulent]

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.

 

[chinito]

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.

 

[springf2000]

oip3=iip3+G

 

[abdoeng]

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

 

[Element_115]

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.

 

[filtershaoyong]

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