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Impact of Mismatch on System Noise Figure

Question asked by thienpham on Apr 14, 2007
Latest reply on Apr 14, 2007 by thienpham
I have a filter cascaded with a LNA and I try to understand how the mismatch between the two would impact on the noise figure when these are put together (the LNA is connected at the output of the filter).  For instance, the filter insertion loss is 1dB and the return loss are 16dB at both input and output. The LNA has a gain of 15dB, the input return loss of 14dB, and a noise figure of 2dB.  Can anyone help please.