How Does Voltage Affect Decibel Levels?

[exilus29]

does dB increases when voltage increases?can sum1 state or declare a formula or proof?

 

[Bob S]

Decibels are a ratio, nothing more. The convention is that dB's increase as voltage increases. Example:
Consider a signal with -114 dBm signal power (0 dBm is 1 milliwatt). If the signal voltage increases by a factor of 10, from V₁ to V₂, what is the signal power?

20 Log (V₂/V₁) = 20 Log(10) = 20 dB

-114 dBm + 20 dB = -94 dBm

Bob S