Re: [Amps] Designing the Cleanest Linear with RF Negative

[Peter Chadwick]

Karl-Arne's comments are very valid about receiver in band linearity. Designing an AGC stage that gives good linearity as the gain is reduced is not as easy as might be thought. Been there, done that...
Similarly, about producing clean signals for IMD testing. Wrote an Application note some 25 years ago - had 'professional' customers who had problems...

As far as the 'IMD against tone' and 'IMD against PEP' is concerned, as long as you state which one you're using, it doesn't matter. ITU recommendations use PEP, because that's more valid when you are doing spectrum sharing studies. As it is, of course, for in band IMD measurements.
As far as using a receiver S meter is concerned - the S stands for 'suspicious'. Rich said 'sucky' but it comes to the same thing!
73
Peter G3RZP