Receiver Sensitivity Calculator

Compute minimum detectable signal (sensitivity) from bandwidth, noise figure, temperature and required SNR. Based on the kTB + NF relation.

Inputs & Results

Noise Figure (NF, dB) Equivalent Noise Bandwidth

Physical Temperature (K) Required SNR at detector (dB) Implementation / fade margin (dB) Optional: Actual signal level to check SNR (dBm)

Results will appear here.

RX Block Diagram & Sensitivity Theory

Static Receiver Front-End Diagram

Key Equations

N₀ (dBm/Hz) ≈ −174 dBm/Hz + 10·log₁₀(T / 290)

N_ideal (dBm) = N₀ + 10·log₁₀(B_Hz)

N_system (dBm) = N_ideal + NF + margin

Sensitivity (dBm) = N_system + SNR_required

The sensitivity is the minimum signal power at the receiver input that still achieves the required SNR at the detector. In practice, additional implementation losses, coding gain, and interference can shift the required margin.