Abstract:

An improved global optimum genetic algorithm are described, reproduction, crossover and mutation operators are automatically optimized in the algorithm. The time searching the best of all reproduction, crossover and mutation operators is saved and the speed of parameter extraction is quickened. All 16 parameters of the Ga_0.49In_0.51P/GaAs hetero junction bipolar transistor (HBT) small signal equivalent circuit model are extracted from S parameters in the range of 1~26.5 GHz. Excellent agreement between the modeled and measured device performance is achieved in a wide range of operating conditions.

Key words: an improved genetic algorithm, small signal equivalent circuit model, parameter extraction