Ron65,
There is a great new frequency modeling tool in Multisim v11 that can likely help your situation. If you have the datasheet that gives you the frequency response, you can now directly put this into our the new Multisim component "Frequency_Table_Function".
Its found under Sources->CONTROL_FUNCTION_BLOCKS->FREQUENCY_TABLE_FUNCTION within the Master Database.
The data can be put into (mag, phase) format or (real, imaginary) format whichever is best for you to work with. Also there is a good example that shows some of the use case and limitations of the methods for modeling devices such as this with these type of transfer function models...
File->Open Samples->S-DomainFunctions.ms11
Regards,
Pat Noonan
Business Development Manager
National Instruments
