Research for SiGe HBT

In this paper, a SiGe HBT was described, which was based on a unique process technology. To characterize the SiGe HBT, HP8510C network analyzer, HP83650A synthetic signal sources, HP8517b S parameter measuring systems etc. have been used for radio frequency performances. The measurements showed the satisfactory results. The SiGe HBT cutoff frequency f/sub T/ is 108GHz, and the maximum oscillation frequency f/sub Max/ is 157GHz.