I'm searching for an appropriate RF amplifier and it prompted me to read up on the third-order intercept point IP3. I came across a rhetorical question that pretty much summarizes mine.
Why should we concern ourselves with some fictitious point that the amplifier will never reach? The answer is that there is a mathematical relationship between the two. Given the intercept point, we can calculate the intermodulation product for any input/output power.
But I felt that the pure theoretical explanation was a bit of a let-down. How do I use the IP3 when I'm speccing an amplifier?
Also, is it possible to output the signal at the IP3 beyond the 1-dB compression point?