TABLE OF CONTENTS Here is a method for creating SPICE models for transistors that are not included in a device library
By No l Boutin
From APPLIED MICROWAVE & WIRELESS, VOL. 11, NO. 4, APRIL 1999
This paper presents a simple procedure for SPICE high-frequency small-signal variational modeling of a transistor from the information contained in its data sheets. This is useful when the transistor is not listed in the SPICE model library and only the variational analysis is required. Instead of trying to find the best substitute from the library, this article shows how you can build your own model. The derived model gives better simulation results than any one that can be obtained by using an equivalent transistor model from the library.
The proposed model can be used for modeling not only transistors but any quadripole whose y-parameter values are known as a function of frequency.
Consider the variational y-parameter model of a quadripole illustrated in Figure 1. This model uses two voltage controlled-current sources and two admittances. At high frequencies, the value of each y-parameter is a frequency-dependent complex number. As we will show, the two controlled sources can be modeled directly with a PSpice model. This is not the case for the two admittances y 11 and y 22. The values of the R, L or C element constituting those two admittances are frequency independent and can be modeled with fixed values elements. This works well for a narrow-band circuit but...
