Pumping current into a regeneration latch of a comparator, including: a first transistor configured to receive a first constant current from a first constant current source; a first current mirror coupled to the first transistor and configured to provide a first bias current, wherein the first transistor substantially mirrors the first constant current into the first bias current in the first current mirror; a second transistor configured to receive a second constant current from a second constant current source; a second current mirror coupled to the second transistor and configured to provide a second bias current, wherein the second transistor substantially mirrors the second constant current into the second bias current in the second current mirror; and a third transistor configured to combine the first bias current and the second bias current, wherein the third transistor pumps the combined bias current into the regeneration latch.