TPSM82903: Pseudo circuit for SIM

Part Number: TPSM82903

Tool/software:

Hi expert,

In order to perform SIM of input impedance(with Keysight ADS), we are considering creating a simple pseudo circuit (SIM model) of TPSM82903SISR.
Specifically, We referred to the waveform in Figure 8-39 of D/S and created a pseudo-circuit that responds in a similar way.

The pseudo circuit and its output waveform are shown below.

Is the method we adopted to consider the pseudo-circuit appropriate?
Also, is the above pseudo-circuit a valid circuit to use as an input impedance SIM model?

It is very helpful, if you give us comments.