Hello All, I have some questions related to amplifier, which I have seen as being central to many important blocks. 1) Is the amplifier's basic function to amplify the input? 2) Does the input have to be voltage or can be current also? 3) Does the input have to be DC or can be AC too? 4) Is the amplifiers performance (or the poor performance) measured by how much the output is off with respect to input in terms shape of the output (not amplitude). In other words, is it undesirable for shape of the output change wrt to input? 5) Probably a silly question - if amplifying the input is the main requirement, is it not possible to do this in a digital domain and then bring the output back to analog domain. Is it due to latency of processing associated with it?