Modelling of parasitic effects induced by electrically active defects in a SiGe HBT M. Lakhdara, S. Latreche and C. Gontrand Eur. Phys. J. Appl. Phys., 43 1 (2008) 55-63 Published online: 24 June 2008 DOI: 10.1051/epjap:2008134