Software Module for Determining Parameters of a Bipolar Transistor SPICE-Model Using Static Volt-Ampere Characteristics

A software module was developed to calculate the main parameters of the SPICE-model of a bipolar transistor based on its static volt-ampere characteristics. This software module is based on the Gummel-Poon model. To build a SPICE-model of bipolar transistors, its functionality includes graphic representation of static volt-ampere characteristics, as well as calculation and output of basic parameters of the Gummel- Poon model (saturation current, non-ideality coefficient in forward connection, base current amplification factor in forward connection, forward Earlie voltage, base resistance and collector resistance). The advantages of the developed software module are: the ability to obtain the basic parameters to build a SPICE-model of bipolar transistors with a minimum set of input data; convenient data input; graphical display of volt-ampere characteristics of the studied bipolar transistor. The disadvantages include a significant error in the calculation of saturation current, base resistance and collector resistance, but it does not have a significant impact on the characteristics of the SPICE-model. We propose a way to automate measurements of static volt-ampere characteristics of bipolar transistors using a simple device built on field-effect transistors, controlled by a microcontroller.