Patent ID: 6294948
Filing Date: 2001-09-25
Classification: H02M

Abstract:
A charge pump system for providing a pumped output voltage, said system comprising:a clock generator for generating at least one clock signal; andat least one pump stage, said pump stage comprising:a first boot circuit for booting a first voltage to a second voltage higher than said first voltage using said at least one clock signal;a second boot circuit for booting a third voltage to a fourth voltage higher than said third voltage using said at least one clock signal;a first unidirectional current device disposed between an output node of said first boot circuit and an output node of said second boot circuit, said first unidirectional current device providing a first pre-charge voltage to said second boot circuit from said first boot circuit; andan output transistor for delivering a voltage from said output node of said first boot circuit to an output terminal in response to a signal applied from said output node of said second boot circuit to the gate of said output transistor.