US Patent 7368978 Self regulating charge pump

A charge pump includes a transistor of the charge pump modified to regulate a supply voltage to substantially reduce noise from the supply voltage when charging the capacitor of the charge pump and subsequently reduces noise at the voltage output. The charge pump may have a regulating transistor for charging or for pumping or for both. The regulating transistor requires a regulated bulk voltage and a modulated gate voltage to enable regulation of the supply voltage. The regulated bulk voltage may be supplied by a small regulator.