Patent ID: 7649325

Claim:
A circuit, comprising; a capacitive element for coupling across a load clement to be energized by a DC signal; a first sense element to monitor an instantaneous sum of currents through the load element and the capacitive element; a switching element to control current through the first sense element; a second sense element coupled to the switching element to sense current through the switching element; an energy storage element coupled to the switching element, a differential transconductance amplifier having inputs coupled across the first sense element, wherein an output of the transconductance amplifier contains DC and switching element switching information; a second capacitive element coupled to the output of the differential transconductance amplifier; a unidirectional current flow element allowing current flow to the load element; and a converter circuit to control the switching element; wherein the converter circuit regulates to the current level monitored across the first sense element, and wherein a converter regulation loop includes a dominant pole to average the current sensed through the first sense element, wherein the differential transconductance amplifier and the second capacitive element provide the active and reactive element for the dominant pole to average the current sensed through the first sense element.