A Wiener-Type Dynamic Neural Network Approach to the Modeling of Nonlinear Microwave Devices

作者：Liu, Wenyuan^*; Na, Weicong; Zhu, Lin; Ma, Jianguo; Zhang, Qi-Jun

来源：IEEE Transactions on Microwave Theory and Techniques, 2017, 65(6): 2043-2062.

DOI：10.1109/TMTT.2017.2657501

• Neural networks
• nonlinear device modeling
• optimization
• simulation
• wiener system

A new Wiener-type dynamic neural network (DNN) approach for nonlinear device modeling is proposed in this paper. The proposed analytical formulation of Wiener-type DNN structure consists of a cascade of a simplified linear dynamic part and a nonlinear static part. The simplified linear dynamic equations are obtained by vector fitting enhancing the efficiency of the model. A new formulation and new sensitivity analysis technique is derived to train the proposed Wiener-type DNN with dc, small-and large-signal data. A new gradient-based training algorithm is also formulated to speed up the training of proposed Wiener-type DNN model. The proposed Wiener-type DNN model can be trained to be accurate relative to device data. Furthermore, the proposed Wiener-type DNN provides enhanced convergence properties over existing neural network approaches such as time delay neural network (TDNN) and TDNN with extrapolation. Application examples on modeling GaAs metal-semiconductor-field-effect transistor, GaAs high-electron mobility transistor (HEMT), and a real 2x50 gatewidth GaAs pseudomorphic HEMT are presented. The use of Wiener-type DNN model in harmonic balance simulations demonstrates that the Wiener-type DNN is a robust method for developing models for different types of microwave devices. These models could be implemented into circuit simulators conveniently.

• 出版日期2017-6
• 单位天津大学; 广东工业大学