BJT circuits simulation including self-heating effect using FDTD method

In this paper the operation of Bipolar Junction Transistor (BJT) with self-heating effect is simulated by 3-dimensional Finite-Difference Time-Domain (FDTD) method. A three-dimensional simulation program is developed in which the effect of the operating point on the BJT internal temperature rise is included. The simulation software works out the change in temperature by calculating the BJT power dissipation and repeats the simulation process by applying the new obtained temperature into the Gummel-Poon (GP) model. The two consecutive simulation results will determine the simulation iteration. The comparison between the experimental results and those of CAD-Thermal simulation and the FDTD simulation results shows that it is possible to add new features to the FDTD simulation.