What is a DB ?

What is DB ?

• The term dB is an abbreviation of decibel, which is equal to 1/10th of a Bel
• It’s a very small quantity, is a logarithmic measure of the ratio between two quantities.
• The unit dB can also be used to represent an absolute power value,
• By defining a reference and adding the corresponding suffix to dB.
• For example, dBm stands for dB with reference to 1 milliwatt (mW).
• Therefore, 1 mW = 0 dBm

 Milliwatts to dBm Conversion

mW :   0.00001

dBM: -50 

mW :   0.0001

dBM: -40

mW :   0.001

dBM: -30

mW :   0.01

dBM: -20

mW :   0.1

dBM: -10

mW :   1

dBM:  0

mW :   2

dBM:  3

 mW :   10

dBM:   10

 mW :   100

dBM:    20

 mW :   200

dBM:   23

 mW :   400

dBM:  26 

 mW :   1000

dBM:  30