A regulated charge pump has a negative charge pump for generating a first output voltage according to an oscillation signal, and a regulator. For example, an on-die cache is disclosed which includes a first memory array having a defective array line; a second memory array having a defective array line; and a redundant memory array having a plurality of array lines. Once the approximation of the output current is known, it is multiplied by a known fixed cable resistance, and this value is subtracted from the feedback sensor output before it is subtracted from the digital reference.