Communication Systems Noise in Analog Communication System Noise Temperature and Noise Figure

Two resistors R1 and R2 (in ohms) at temperatures T1K and T2K respectively, are connected in series.

Their equivalent noise temperature is

1
T1 + T2
2
R1T1 + R2T2
3
(R1T1 + R2T2) / (R1R2)
4
(R1T1 + R2T2) / (R1 + R2)

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