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The results of an analysis based on the solution of the 2‐D Poisson equation are presented to investigate the dependence of the small‐signal parameters on biasing conditions. The switching parameters are calculated simply from the charge variations, and it is found that the characteristics depend only on the basic device parameters and terminal voltages. The high value of f_t proves the utility of the model in the design of low‐power MMICs. A maximum frequency of 101.42 GHz at 0.25 μm is obtained, and the results show close agreement with the experimental data, thereby proving the validity of the proposed model. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 25: 377–383, 2000.