Noise Figure
Estimate cascaded receiver noise figure for a three-stage RF front end. Early gain matters: a good first stage can suppress downstream noise contributions.
Stage 1: LNA
Stage 2: Filter
Stage 3: Mixer
Total noise figure
1.404 dB
F = 1.3817
Equivalent noise temperature
110.7 K
referenced to 290 K
Total gain
45.00 dB
31,623 linear
Dominant contribution
LNA
+1.2589 F term
Receiver chain
The charts show how each stage contributes input-referred noise and how upstream gain shields later stages.
Lower bars mean less input-referred noise in the total factor.
Cumulative gain shielding
Gain before a noisy stage divides its Friis term
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