This paper presents the implementation of a parallel solver for the 3D Poisson equation applied to gradual HBT simulation in a memory distributed multiprocessor. The Poisson equation was discretized using a finite element method (FEM) on an unstructured tetrahedral mesh. Domain decomposition methods were used to solve the linear systems. Wehavesimulated a gradual HBT, and we present electrical results and some measures of the efficiency of the parallel execution for several solvers. This code was implemented using a message-- passing standard library MPI and was tested on a CRAY T3E. Keywords: 3D Poisson equation, Gradual HBT, Domain Decomposition, Multiprocessors. INTRODUCTION Heterojunction bipolar transistors are nowadays an activeareaofresearchduetointerest in their high--speed electronic circuit applications. For example InP/InGaAs HBT's have attained frequencies of over 200GHz . Developmentofsimulators for HBT's is essential in order to better understand their physical beh..
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