Interactive Cascade NF Calculator
Cascaded Noise Figure (up to 4 stages)
| System NF | — |
| Total Gain | — |
| Receiver Sensitivity | — |
Friis Formula Reference
F_total = F₁ + (F₂−1)/G₁ + (F₃−1)/(G₁G₂) + (F₄−1)/(G₁G₂G₃) Key insight: High first-stage gain G₁ suppresses all later noise. Sensitivity = −174 + NF_sys + 10·log₁₀(BW_Hz) + SNR_min [dBm]
RF View: Analyze LNA gain (S21) and matching (S11) to optimize the first stage of your receive chain — the most critical factor in system noise figure. Free on Android.