A bandgap reference circuit can use various output stages to implement a controlled
feedback method of sensing and supplying the needed load current through a sensing
network. A small amount of circuitry can be added to a class AB output stage to
decouple the bandgap reference feedback from a capacitive load and simultaneously
sense load current needs and boost current as needed while minimizing voltage droop.
Such circuits can be implemented using relatively compact designs while still reducing
droop, and thus allowing the use of a large external capacitor to reduce noise
and maintain good power supply rejection.