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Large-signal compact modeling of SiGe HBTs integrated into a new IBM BICMOS technology geared towards high-efficiency power amplifiers is described. The technology exhibits a record 73% PAE at 5.75 GHz in class AB operation. A scalable HiCUM model (high current model) is developed to accurately model the DC, small-signal and large-signal characteristics. Results of DC, fT characteristics, output power, PAE and AM-PM performance of the device are discussed in detail.