custom VCCS

Dear all

I want to design a vccs to implement this function:

I(y)<+ tanh(V(x));

I have done that using a verilogA model and I connect it in the cadence circuit which is as in the attached file, the model itself works fine but I want it to act as a real electronic component when connected to the circuit, by means when I change the output resistance the output current from this component should be changed accordingly as in the real electrical circuits, how can I do that, the current is always fixed and not affected by the resistor next to it. Because at the end I'll do a lab work by which I will use a similar component .

I read about bsource but I did not find it in any of the libraries !

any suggestion will be appreciated.

Thank you