Noise Power Calculations in dB or dBm

[Kartik.Sulakh]

The ourput Noise Power is given as
N_o = kT_sBG + kT_eBG
...= k.(T_s+T_e).B.G
But when it is asked in dB or dBm,
How to calculate it something like 10Log₁₀(Value) or 20Log₁₀(Value)

 

[f95toli]

dBm is a unit of power (dB referenced to 1 mW)
dB is a (dimensionless) ratio (value/reference in dB).

Hence, if you want noise power you need to use dBm.
All you need is 10log10 (P/P0) where P is the power and P0 is 1 mW.