Constructing transportable behavioural models for nonlinear electronic   devices
  We use radial basis functions to model the input--output response of an electronic device. A new methodology for producing models that accuratly describe the response of the device over a wide range of operating points is introduced. A key to the success of the method is the ability to find a polynomial relationship between the model parameters and the operating points of the device. 
David M. Walker, R. Brown, and N. B. Tufillaro