Howtosignalprocessing
What is the gain of 20 in dB?
dB and Voltage gain (20dB = 10x)
When talking about voltage, 6dB represents a ratio of two to one or a doubling of voltage. 20dB would represent a ratio of ten to one for voltage - so 20 dB would be 10 times the voltage. A 40dB voltage gain would be 100 times the voltage.
How much is 10 dB attenuation?
The 10 dB corresponds to a voltage attenuation ratio of K=3.16 in the next to last line of the above table.
What is 10 dB gain?
10 dB gain/loss corresponds to a ten-fold increase/decrease in signal level. A 20 dB gain/loss corresponds to a hundred-fold increase/decrease in signal level. In other words, a device (like a cable) that has 20 dB loss through it will lose 99% of its signal by the time it gets to the other side.
