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I agree with that, but I would like to point out that the following statement is a bit iffy, verging on totally wrong.Unity gain tends to refer to the voltage gain. You can have unity gain in a power amp as it can still have current, thus power gain.
BTW Unity voltage gain is a gain of 1 (1 volt in and 1 volt out).
In dBs, it's 0dB as 20 x log (1) = 0.
That's true by definition. But it is common (though not technically correct) to refer to voltage gain in dB as 20 log (Vo/Vin) even when the input and output impedances are different.I agree with that, but I would like to point out that the following statement is a bit iffy, verging on totally wrong.
In dBs, it's 0dB as 20 x log (1) = 0.
The deciBel is defined as the ration of two POWERS.
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JimB said:If an amplifier has current gain but no voltage gain, it still has power gain.
If an amplifier has current gain but no voltage gain, it still has power gain.
JimB