Large-signal model for microwave FETs under CW laser stimulation
This article presents the results of research on the large-signal dynamic behavior (pulsed IN curves) of PHEMT devices, in the overall IN plane, when the incident optical-in put-power level is changed. A complete bias and the optical-power dependency of the parameters used in the large-signal model for a PHEMT device are determined from the experimental scattering parameters and the DC and pulsed measurements. All the derivatives of the model shown here are continuous in order to provide a realistic description of the circuit distortion and intermodulation phenomena. The model is also valid for GaAs MESFETs. The results obtained for the model exhibit very good agreement with the measurements. (C) 2005 Wiley Periodicals, Inc.
cw laser mesfet hemt nonlinear model large signal small signal electro-optical model optical power