Output also depends on the circuit load impedance. This may again seem obvious, but
there is an erroneous belief that because feedback reduces the output impedance of an
op-amp in proportion to the ratio of open- to closed-loop gains, it should be capable of
driving very low load resistors. Well of course to an extent it is, but Ohm’s Law is not
so easily flouted and a low output resistance can only be driven to a low output voltage
swing, depending entirely on the current drive capability of the output stage. The
maximum output current that can be obtained from most devices is limited by package
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