The circuit has an output stage comprising a current source and a current sink. The circuit also has a comparison stage operable to compare a current mirrored from the current source with a current mirrored from the current sink to determine a difference therebetween. The mirrored currents may be a fraction of their corresponding output currents. Moreover, the fractions may be different from each other. A first current boost stage in the circuit is operable to provide a controlled current boost to the output stage if the difference between the compared currents crosses a threshold. The current boost may be a current sink boost or a current source boost.