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Investigation on conductive electromagnetic pulse (EMP) effects on performance degradation and breakdown of GaAs MESFET and LDMOS FET-based power amplifiers (PA) are performed in this paper. A special measurement system is built, which consists of an adjustable EMP source, one controller, couplers, limiters, attenuators, one four-channel oscilloscope, and DUT. The PAs performance degradation and their...
This article discusses a laterally diffused MOS (LDMOS) FET's thermal-stress failure test experiment under high-power microwave (HPM) pulses with different pulse widths and describes the 2-D transient coupled electro-thermal-stress (E-T-S) simulation of its structure model via finite-element method (FEM). The test experiment system mainly consists of an HPM generator, an oscilloscope, some attenuators...
This paper presents thermal and stress breakdown effects in a LDMOS FET under the impact of High Power Microwave pulses. Experimental investigations of the LDMOS FET-based power amplifier (PA) are performed under HPM pulses. The Electro-Thermal- Stress (E-T-S) breakdown of the device is observed. To characterize temperature and stress distribution of the LDMOS FET, we developed a physical electro-thermal-stress...
In this paper, a new method of dynamic spectrum sharing with bidding is proposed in cognitive radio system. The Cournot game model of the proposed method is established, and it is proved that Nash Equilibrium of the new game model is existed, which can be found out by eliminating inferior point repeatedly. The method takes both primary and secondary users' earnings into account respectively when sharing...
Cognitive Radio (CR) is a promising technology for dynamic spectrum access with the ability of observing the surrounding environment and adapting itself to the change of network environment. For the problem of spectrum sharing among a primary user and multiple secondary users based on Game Theory, an improved utility function of the second user is proposed. In this function, the influence of the shared...
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