|
发表于 2008-6-5 13:06:02
|
显示全部楼层
If you want to use the Frii's equation to calculate the cascaded NF, each stage's NF should be referred to the output impedance of the previous stage, and the power gain of each stage should be the available power gain (output matching is assumed).
You could also use input referred noise and voltage gain to calculate the cascaded NF. However, the input referred noise of each stage is also a function of the output impedance of previous stage. |
|