[Amps] Linearization problem

[Manfred Mornhinweg]

Hi Marv,

>     Directional coupler.

I don't see how that could work.

Indeed, if there was such a thing as a near-perfect directional coupler, in 
which the signal apearing on the side port depends _only_ on the signal at the 
input port, and also the coupler completely prevents the ouput load changes from 
affecting the input signal, then it would work fine. But I have never seen such 
a coupler! In all real-world directional couplers I know, the signal appearing 
on the side port varies when the load on the output port changes. So, in my 
application, the distortion caused by the amplifier on the drive signal would 
also appear at the coupler's side port.

Maybe I'm misunderstanding  what exact type of coupler you mean, or how you 
would apply it. Can you give some example?

Manfred


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