A voltage regulator improves its transient adjustment response by
amplifying error in its regulation feedback control path, including any
droop-related error. Amplifying the error speeds up the voltage
regulator's response to load changes and droop control adjustments by
exaggerating the feedback error. Thus, in at least one embodiment, a
droop control circuit imparts a droop-related offset between an output
feedback signal and a reference signal responsive to a droop adjustment
signal, and a response-enhancing amplifier circuit amplifies that offset
for input to an error sensing circuit of a regulation control circuit.
The gain and frequency response of the response-enhancing amplifier
circuit may be set as a function one or more regulation stability
criteria, and the response-enhancing method may be adapted to a variety
of voltage regulator topologies. Such topologies include, but are not
limited to, PWM regulators and hysteretic regulators.