2016年7月17日 星期日

What is dBm?

Raytac Corporation
A BT4.1 & BT4.2 module maker based on Nordic nRF51 & nRF52 solution 
(nRF51822 & nRF51422 & nRF52832 & nRF51802)
Tel: +886.2.3234.0208
email: service@raytac.com  
 https://raytacblog.wordpress.com/

What is dBM?
From Spec sheet, we can find the output power always stated as dBM.
For example:
Nordic nRF52832
Transmitting power (+4dBM~-20dBM) / Receiving Sensitivity (-96dBM)

dBm is the unit for radiowave, it is a way to express the comparison between the reference signal value

The reference value is 0dBM at 1mW, the unit represented as shown below

1/10000 times = -40 dBm
1/1000 times = -30 dBm
1/100 times = -20 dBm
1/10 times = -10 dBm
1mW =     0 dbm ← Reference Signal Value
10 times  =  10 dBm
100 times  =  20 dBm
1000 times  =  30 dBm

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