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The first stage or the differential input stage of the amplifier must have very high input impedance. This will cause the op-amp to draw very negligible amounts of input current. The very small input current enables the user to utilize the ideal op-amp equations for circuit analysis purposes.
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We also see that the op-amp must have very low output impedance. This minimizes the loading of the output ofthe op-amp by output stage of the op-amp. The outputstage delivers current to the op-amp’s load and it may ormay not have short circuit protection.
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Output impedance of an amplifier: Amplifiers should have very low output impedance and usually it’s assumed to be zero and in this way op-amps will behave like a voltage source and it will be capable of driving a very wide range of loads.
Testone said:for maximum power transmission.