A. Pacheco-Sánchez, E. Ramírez-García, L. Rodríguez-Méndez, M.Galaz-Larios., C. Márquez-Beltrán, and M. Enciso-Aguilar, Microwave noise sources contributions to SiGe:C/Si and InP/InGaAs HBT’s performances, Rev. Mex. Fís. 59, (2013).