aryajur
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My question is a very basic one. Simply putting why do we need a power amplifier? Putting this in another way -- if we are receiving a signal say from an antenna, which has a output impedance say 50 ohms. So why would it be better to have the stage connected to this antenna have an input impedance = 50 ohm rather than have an impedance = infinite i.e. why would we want maximum power transfer, rather than maximum voltage transfer.
I am confused because the signal that the antenna is receiving, if we know the voltage waveform of the signal then that signal can be reproduced easily, isn't it? So why not have a voltage amplifier connected to the antenna???
I am confused because the signal that the antenna is receiving, if we know the voltage waveform of the signal then that signal can be reproduced easily, isn't it? So why not have a voltage amplifier connected to the antenna???