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A caveat.
When measuring voltage and calculating dB, the impedance at the input and output of the circuit should be the same, otherwise the power relationship is not correct.
Sometimes a gain of an amplifier will be expressed in dB when the input and output impedances are not the same.
This is not a correct thing to do, but it is done.
JimB
Find the input and output impedances, measure the voltages, calculate the input and output powers (W= V^2 /R), and the calculate the dBs using 10 x Log(P/p).Suppose the input and output impedances are not equal, what should be done to get the correct power relationship?
I am not completely sure what you are asking here.some amplifiers are cascaded, is this applicable to single amplifiers only?
I am not completely sure what you are asking here.
If you have two amplifiers, one with a gain of 14dB and one with a gain of 10dB, the overall gain of the cascaded pair is the sum of the individual gains in dB, in this case 24dB.
JimB