notor research - dB Conversions

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Table I: dB Conversions for 50 Ohm Reference Impedance

Convert
From
To 
  dBm dBV dBmV dBmV
dBm 0 -13 +47 +107
dBV +13 0 +60 +120
dBmV -47 -60 0 +60
dBmV -107 -120 -60 0

 

Table II: dB Conversions for 75 Ohm Reference Impedance

Convert
From
To 
  dBm dBV dBmV dBmV
dBm 0 -11.25 +48.75 +108.75
dBV +11.25 0 +60 +120
dBmV -48.75 -60 0 +60
dBmV -108.75 -120 -60 0


Example: Convert +10 dBm to dBmV

A. 50 Ohm Reference Impedance:  dBmV = +10 dBm + 47 dB = +57 dBmV

B. 75 Ohm Reference Impedance:  dBmV = +10 dBm + 48.75 dB = +58.75 dBmV

 

 

 

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Last revised: February 2, 2017