EMC Related Formulae

Robert RichardsPage 103/30/03 EMC Related FormulaeLog Linear VoltagedB V to Volts()()20/12010 =VdBV Volts to dB V()120log20+=VVdB dBV to Volts()20/10dBVV=Volts to dBV()VdBVlog20=dBV to dB V120+=dBVVdB dB V to dBV120 =VdBdBV Log Linear PowerdBm to Watts()()10/3010 =dBmWWatts to dBm30)log(10+=WdBmdBW to Watts()10/10dBWW=Watts to dBW)log(10 WdBw=dBW to dBm30+=dBWdBmdBm to dBW30 =dBmdBWLog Linear CurrentdBuA to uA()20/10 AdBA =uA to dBuA)log(20 AAdB =dBA to A()20/10dBAA=A to dBA)log(20 AdBA=dBuA to dBA120 =AdBdBA dBA to dBuA120+=dBAAdB Log Linear ImpedancedB(ohms) to ohms()20/)(10ohmsdBZ=ohms to dB(ohms)()ZohmsdBlog20)(=Term ConversiondBm to dBuVdBmZvdB++=)log(1090 dBuV to dBm)log(1090 ZVdBdBm = dBuA to dBm90)log(10 +=ZAdBdBm dBm to dBuA90)log(10+ =ZdBmAdB dBuA to dBuV)log(20 ZAdBVdB+= dBuV to dBuA)log(20 ZVdBAdB = Volts to Amps & WattsZVA=ZVW2=Amps to Volts & WattsZAV*=ZAW*2=Watts to Volts & AmpsZWV*=ZWA=RF Related , Field Strength & Power DensitydBuV/m to V/m)20/)120)/(((10/ =mVdBmV V/m to dBuV/m()120/log20/+=mVmVdB dBuv/m to =mVdBmdBm dBmW/m2 to +=mdBmmVdB dBuV/m to =mVdBmAdB dBuA/m to +=mAdBmVdB dBuA/m to dBpT2/+=mAdBdBpT dBpT to dBuA/m2/ =dBpTmAdB W/m2 to V/m377*)2/(/mWmV=V/m to W/m23772)/(2/mVmW=wound coil Flux Density),(20))((4mradiusampsturnsT =uT to =A/m to uT)/(* Robert RichardsPage 203/30/03 Antenna (Far Field)Gain, dBi to numeric)10/(10dBinumericG

Robert Richards Page 2 03/30/03 Antenna (Far Field) Gain , dBi to numeric 10 (dBi /10 ) Gain numeric = Gain , numeric to dBi dBi =10 log( Gain numeric )

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