output current is applied usually to a suitable node in the input stage of the control circuit error amplifier etc this current is used to oppose the normal drive currents thereby reducing the nodal slew rates in the signal path another way to view this is to consider the invention as applying negative feedback during output slewing of the system as soon as the system achieves its desired output level the feedback current reduces to i1 which is so small in magnitude as to cause minimal effect fig3 shows the schematic of the unity gain configuration of the operational amplifier of fig1 a in detail including the bias scheme of transistor n1 and resistor r1 and the internal frequency compensation of capacitor c1 and resistor r2 for this example a unity gain configuration is chosen for simplicity there being no requirement for a feedback resistor network also the choice of a capacitive load of 200 pf represents a difficult load and the type that a power supply might be expected to drive under certain conditions in the circuit of fig3 resistor r1 sets the current through transistor n1 to be vdd vthres n1 r1 where vthres n1 is the threshold voltage of transistor n1 this current is mirrored to transistors n4 and n5 in the specific example given so that the current in each of transistors n4 and n5 is twice the current in transistor n1 due to the particular sizing of these transistors n4 and n5 100w 16l with respect to transistor n1 50w 16l where 34 w 34 and 34 l.