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Click here to view an example of a cascaded system. 
Note that when calculating cascaded noise figure, quantities must be expressed as
ratios, NOT as decibels. By convention, lower case variables represent ratios, while upper case
variables represent decibels (dB). Conversions: nf = 10^{NF/10} ↔ NF (dB) = 10 * log_{10} (nf) 
In Compact Form: nf_{N}_{ = } , where N = number of stages 
Cascaded Noise Figure In Expanded Form:

Click here to see Agilent's App Note 1303 on using a spectrum analyzer to measure noise figure. 
Conversion Between Noise Figure and Noise
Temperature Noise Temperature (K) = 290 * Noise Figure (dB) = 10 * log10 These equations assume a room temperature reference (290 K). If applicable, use whatever your reference temperature is in place of the 290. 
Cascaded Noise Temperature Calculation 

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