RF System Design

Thermal Noise / Receiver Sensitivity

Calculate kTB noise, receiver noise floor and theoretical sensitivity.

Inputs

Results update as you enter values. Inputs stay in this browser session only.

Noise bandwidth

MHz

Source temperature

Receiver noise figure

Required SNR

Thermal noise density

-174 dBm/Hz

Integrated source thermal noise

-114 dBm

Receiver noise floor

-114 dBm

Theoretical receiver sensitivity

-104 dBm

N₀ = 10 log₁₀(kT/1 mW); N = N₀ + 10 log₁₀(B); sensitivity = N + NF + required SNR.

Available thermal noise from a matched source; assumes equivalent noise bandwidth and specified receiver NF.