Deutsche Version 
The reinforcement and also the amplification factor are called simply "gain" and its increase value with
amplification is positively designated. Loss or decrease is the damping factor," negative gain" or also
"attenuation". Field and energy gain factors, and loss factors are ratios. Gain is usually defined as the mean ratio of the signal output of a system to the signal input of the same system. It is often expressed using the logarithmic decibel (dB) units ("dB gain"). A gain greater than one is called amplification is the defining property of an active component or circuit, while a passive circuit will have a gain of less than one. 
● Energy quantities: e. g. Power "Decibel, Gain, and Loss) ●
Enter the value for P in and P out and press the "=" key.
To use the calculator, simply enter a value. The calculator works in both directions of the ↔ sign. 
Field quantity x always use the RMS value  but don't do that for the energy quantity y.
Energy quantity y is field quantity x (amplitude rms) squared: y ~ x^{2}.
Level L in decibel (dB) = 20 × log (x) x = factor (amplitude, field quantity)
Level L in decibel (dB) = 10 × log (y) y = factor (power, energy quantity)
To use the calculator, simply enter a value. The calculator works in both directions of the ↔ sign. 
Field quantity (size):
Energy quantity (size):
There is also the reference power P_{0} = 1 milliwatt or 0.001 watt ≡ 0 dB_{m}
Voltage/pressure Amplification factor 
1 
1.414 = √2 
2 
3.16 = √10 
4 
10 
20 
40 
100 
1000 
Increasing of x dB  0  3  6  10  12  20  26  32  40  60 
Power/intensity Amplification factor 
1 
1.414 = √2 
2 
3.16 = √10 
4 
10 
20 
40 
100 
1000 
Increasing of y dB  0  1.5  3  5  6  10  13  16  20  30 

Questions: For an amplifier with an amplification factor of 100, calculate the following: a) voltage gain in dB. b) voltage gain at the cutoff frequency (break frequency) in dB. c) amplification factor at the cutoff frequency (break frequency). Answers: a) amplification factor 100 = gain 40 dB. b) gain at the cutoff frequency is 3 dB, so it is 37 dB. c) gain 37 dB = amplification factor 70.7 at the cutoff frequency. 
back  Search Engine  home 