Growth and quality control of MBE-based SiGe-HBT for amplifier applications
This study aims at getting precise growth and doping control of the well-designed multiple SiGe heterostructure layers for amplifier applications using MBE. Large efforts have been made in calibrating the deposition rates of Si and Ge, and the doping concentrations, in order to ensure the high quality growth. The measured cutoff frequency was 5.1GHz, which is not high but in an agreement with the simulated value (5.6GHz) made by Medici for such a large size device without using device isolation. Finally, the development of test amplifiers, using the developed SiGe HBT technology, is underway. The broad-band low-noise amplifier with the certain functions has been obtained.
mbe amplifier doping