Noise Figure Calculator
Calculate cascaded noise figure using Friis formula and convert between noise figure and noise temperature.
Calculation Mode
Stage 1 (First in chain)
Stage 2
Stage 3
F_total = F1 + (F2-1)/G1 + (F3-1)/(G1 G2)
Total Cascaded Noise Figure
2.105 dB
Linear: 1.6237 | Te: 180.9 K
Stage Contributions
Stage 1NF: 2 dB, Gain: 20 dB
93.8%Stage 2NF: 6 dB, Gain: 10 dB
4.8%Stage 3NF: 10 dB, Gain: 15 dB
1.4%First stage dominates noise performance - use low NF, high gain amplifier first
Noise Figure Reference
| NF (dB) | Te (K) | Typical Use |
|---|---|---|
| 0.5 | 35 | Satellite LNA |
| 1 | 75 | Low noise preamp |
| 2 | 170 | Good RF amp |
| 3 | 290 | Standard amp |
| 6 | 865 | Mixer/IF amp |
| 10 | 2610 | Passive mixer |