Validating the Model with the AC_validation DUT

The AC_validation DUT contains the setup spars_fwd_active to validate the fit of the nonlinear model to S-parameters measured over bias. No parameters are extracted in this setup.

The bias inputs are preset using existing variables that represent typical bias values. You can alter these bias sweeps in order to examine the model fit at any bias. However, you should not change the values of existing variables. Instead, use new variables or enter numerical values directly into the inputs.

None of the macros is equivalent in any way to this setup.

1	Select the spars_fwd_active setup. Open the plots and arrange them on the screen so that you still have access to the Model window.

2	Select Extract/Optimize.

3

Select y_int_mod > Execute. This computes the intrinsic modeled Y-parameters of the EEBJT2 model over the bias range specified by the inputs. It also automatically calls the s_mod transform, which converts the intrinsic Y-parameters to S-parameters and adds the effects of the extrinsic elements to the S-parameters.

4	Observe the modeled data converge to the measured data in the plots.

5	If you want to save the parameters in the Parameters table in an MDIF (Measurement Data Interchange Format) file for compatibility with Libra, Execute the write_pars_to_file transform and type your own filename for the parameters. A copy of the MDIF file is written to the IC-CAP Status window.