Patent ID: 7889523

Claim:
A device comprising: a charge-pump circuit configured to multiply an input voltage signal into an output voltage signal, the charge-pump circuit including a plurality of charge-pump stages, wherein at least one of the plurality of charge-pump stages includes a weighted capacitor array of pump cells; and a charge-pump controller configured to provide a pump cell select to selectively control the weighted capacitor array of pump cells of the at least one of the plurality of charge-pump stages of the charge-pump circuit, wherein the charge-pump controller tallies a number of clock periods of a clock for which the voltage output is above or below the reference voltage and outputs a pump cell select as a function of the tallied number of clock periods for which the voltage output is above or below the reference voltage and thereby adjusts the capacitance of corresponding charge-pump stages to affect a corresponding change in output impedance of the charge-pump circuit.