From time to time I develop tools and parts for PSpice to ease (and speed up) circuit development.
One of my pet peeves has been that DC, F and G current sources will just merrily keep pumping right out to an infinite voltage.
So I have posted on the Subcircuits and Symbols Page of my web site, CompliantParts.SLB... allowing setting a voltage at which the current dies away (TANH, so stable, unlike most clamping schemes).
These parts will directly drop into your symbol library set-up if you are using PSpice Schematics as your schematic entry tool.
Most likely they can also be imported into OrCAD Capture... if you're lucky ;-)
Or, if you're a glutton for punishment, copy the math into the schematic capture of your choice.
Enjoy!
...Jim Thompson