بررسي رفتار غيرخطي ترانزيستورهاي قدرت فركانس بالا نسبت به تغييرات بار

Studying of Nonlinear Behavior of a High Frequency Power Transistor Using Load Variation

Design of high efficiency power amplifier is a fundamental subject in the most of RF research centers. Fast advances in cellular communication systems especially with appearance of 3G mobile systems is a major motive for RF research center to invent to design and produce the handset with minimum consumption power. Although there are many parameters which affect on the consumption power of a handset, but the most important part is power amplifier. Essential parameter for all power amplifier is linearity. As behavior of the transistor in large signal are naturally nonlinear, studying and modeling of the transistors nonlinearity are indispensable for precise and delicate design of the power amplifier. In this paper, nonlinear analysis is based on Volterra series. The results of the load pull experiments and calculation are compared on various charts. There are excellent convergent between measured and calculation values.