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Decibel ConversionThe decibel (dB) represents a logrithmic ratio between two quantities and is unitless. If the ratio is refered to a specific quantity this is indicated by a suffix (dBm is referenced against 1 mW and dBV is 1 Volt). Originally the dB was for power ratios, given by dB=10 log (P_{1}/P_{2}) Power is proportional to voltage squared, hence the ratio of voltages or currents across a constant impedence is given by dB=20 log(V_{1}/V_{2}) or 20 log(I_{1}/I_{2})
When working with power, 3 dB is twice, 10 dB is 10 times; When working with voltage or current, 6 dB is twice, 20 dB is 10 times
