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In this paper. a SiGe HBT was described, which was based on a unique process technology. To characterize the SiGe HBT, HP85 10C network analyzer, HP83650A synthetic signal sources, HP8517b S parameter measuring systems etc. have been used for measuring radiofrequency performance of SiGe HBT. The measurements showed satisfactory results. The SiGe HBT cutoff frequency fT is 108 GHz, and the maximum oscillation frequency is 157 GHz.