A low-dropout voltage (LDO) regulator that creates a zero in the open loop
gain using a relatively small-sized current control element to divert
part of the supplied load current through a "zero" resistor before adding
it to the output load. The main part of the output load is passed through
a relatively large second current control element. A control signal
generated by an error amplifier (e.g., an op-amp) is used to control the
small current control element, but is passed through a boost zero
compensating resistor before being applied to the large current control
element. The voltage signal developed across the "zero" resistor mimics
the magnitude and phase of a zero in the loop. This voltage signal is
added to the loop gain by, for instance, using a bypass capacitor, and
the resulting feedback signal is supplied to the error amplifier.