ADS : access to data with variable

[Tucco]

Hi,
I tried to make this:
-Sweep a x variable 1 to 100
-performs S parameter simulation (20 freqs)

and I wish
Diff (x) =dB(S21)(x) -dB(S21)(x-1)

Is it possible in ADS ?

Because X and S21 are [100,20] arrays , I tried to write this measurement equation in my schmatic : Diff=dB(S21)-dB(S21)[indep(X,2),::] and many other manners....

but it doesn't work !

HELP ME PLEASE !!!!!!!!!!!

 

[BigBoss]

If you write those equations directly, it will not work."Diff" function is reserved by ADS and it calculates the simple numerical first derivative.
Instead, you should use-for instance-"Differential_sparameters".

 

[Tucco]

OK,
I write "Diff" to simply the post, my real variable is "my_diff_S21"...

Another idea ?