Regarding "amplify small AC signal":
The amplification of an amplifier depends on its operating point.
Therefore, if we insert different DC signals, which differ from each other by a significant portion, then we might damage the amplification.
So as i see it, we must set a permament operating point and allow only small AC signals as an input, small enough to keep the operating point unchanged, is it correct?
Regarding "linearly amplify small AC signal":
When the transistor (in the amplifier) is in cutoff, then all the current thats drawn from the Vcc source will go to the output, so allegedly thats the way to receive the maximum current amplification (if its a current amplifier), since we wont be able to get larger current than that in the output.
But I guess that (in CE current amplifier for example) we want the BJT to be forward biased to have a linear amplification, in order to have the output signal a duplication of the input signal, only with different amplitude?
Thank you.
The amplification of an amplifier depends on its operating point.
Therefore, if we insert different DC signals, which differ from each other by a significant portion, then we might damage the amplification.
So as i see it, we must set a permament operating point and allow only small AC signals as an input, small enough to keep the operating point unchanged, is it correct?
Regarding "linearly amplify small AC signal":
When the transistor (in the amplifier) is in cutoff, then all the current thats drawn from the Vcc source will go to the output, so allegedly thats the way to receive the maximum current amplification (if its a current amplifier), since we wont be able to get larger current than that in the output.
But I guess that (in CE current amplifier for example) we want the BJT to be forward biased to have a linear amplification, in order to have the output signal a duplication of the input signal, only with different amplitude?
Thank you.