Broadband modeling for InP DHBT over 0.2 – 220 GHz

Extraction and verification of small signal equivalent circuit for InP/InGaAs DHBT up to G-band (140 to 220 GHz) is presented in this paper. Based on Π-topology small-signal model, the model parameters are extracted from measured S-parameters directly. Analytical and approximation approach used in this paper allows reducing numbers of model parameters for low frequency analysis. In order to extend the model to higher frequencies, extrinsic parameters are determined using both analytical and optimization methods. The model is verified by comparing the modeled parameters to measured parameters. The investigation results show that the excellent agreements between the measured and simulated data are obtained in the frequency range of 0.2 to 220 GHz.