Stochastic Optimization of the CPL-Function-Based Model for RF Power Transistors

In this article, the simultaneous perturbation stochastic approximation (SPSA) algorithm is proposed to optimize the threshold of the canonical piecewise linear (CPL) function-based models for radio frequency (RF) power transistors. Compared with the existing standard CPL-function-based model, the proposed optimization technique can greatly improve model performance. Two different CPL-based models, the CPL Y/quadratic Y (QY) model and the canonical section-wise piecewise linear (CSWPL) model, are used to verify the proposed technique. Experimental test of a 10-W GaN device from Cree is presented, showing the effectiveness of the proposed technique.