Ebers-Moll Model is an ideal transistor model which describes the operating regions (states) of a transistor. This model is very useful to obtain the information about DC characteristics of a transistor. The transistor operates in active region when emitter junction is forward biased and collector junction is reverse biased. This model generalizes the behaviour of transistor by taking into account the inverted mode of operation of transistor. General Comparison of Three Transistor configurations. Device modelling aims at relating physical device parameters to device terminal characteristics. Device modelling is especially important for integrated circuits. Since simple and accurate device models are required to predict the performance of a circuit. Read More.....