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CASCADE NOISE FIGURE.AMPLIFIERS

Question asked by iyama on May 28, 2010
Latest reply on Jun 18, 2010 by tabbott
I have some doubts, and maybe someone can help me.
In a superheterodyne receiver design,  I want to make a Noise Figure analysis by Spectrasys Simulation from mixer and for our intermediate frequency (3100Mhz). The graphic shows normals values for all components except for the amplifiers. The Noise Figure in these cases depends of the gain(the value showed is: NF value expecificated in the model parameters + gain expecificated in the model parameters) why it is happening?
(In the case of the amplifiers before baxic mixer the values are ok)

Thanks!  

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