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E_n-l_n Noise Performance Analysis for the Cascade Circuits

Wang Jun(Institue of Electronic Engineering,Chian Academy of Engineering and Physics,Chengdu 610003)Dai Yisong (Dept.of Electronic Engineering,Jilin University of Technology,Canchun 130025)  
Based on the En-In noise model of cascade circuits, not only the limitation of Friis theorem is analysed,but also the En-ln noise mathematical model for the cascade cireuits is developed. This model with simple formulas and easy parameter's extraction will facilitate the implementation of the model into the simulation programs for the circuit noise. The analsis also focuses on the minimum noise conditions for the cascade precucuits. Because the correlativity between the En and In is considered, the pnyision of noise calculation for the cascade circuits can be guaranteed effectively.
【CateGory Index】: TN911.4
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