## Noise Power & VoltageP _{ThermalNoise} = k * T * B [Watts], where
Multiply by 1000 to obtain milliwatts and then convert to dBm units or convert to dBW units and add 30 dB: P _{ThermalNoise} [dBm] = 10 * log_{10} (1000 * k * T * B)or P _{ThermalNoise}
[dBm] = 10 * log_{10} (k * T * B) + 30Now that we have the thermal noise at the input, add the system gain and the additional noise added by the system (the NF) to get the noise power at the output: P V _{ThermalNoise} = Sqrt (4 * k * T * B) [Volts]
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