Patent ID: 7969235
Filing Date: 2011-06-28
Classification: H02M

Abstract:
1. A charge pump system circuit to generate an output voltage, including: a plurality of N output generation stages, each having a first branch receiving a first clock signal and providing a first output and a second branch receiving a second clock signal and providing a second output, wherein the first and second clock signals are non-overlapping; a corresponding plurality of N gate stages, each having a first branch receiving the first clock signal and providing a first output and a second branch receiving the second clock signal and providing a second output, wherein the output generation stages and the corresponding gate stages have the same structure; and a corresponding plurality of N first transistors and a corresponding plurality N second transistors, wherein the output generation stages are connected in series with the first and second output of each of the output generation stages except the last in the series respectively connected through the corresponding first and second transistors to provide the input for the next output generation stage, the first and second outputs of the last in the series of output generation stages respectively connected through the corresponding first and second transistors to provide the output voltage of the charge pump, and wherein the gate stages are connected in series with the first and second output of each of the gate stages except the last in the series connected through a corresponding diode to provide the input for the next gate stage, the first and second outputs of each of the gate stages respectively connected to the control gate the correspond first and second transistors, and the first and second outputs of the last in the series being respectively connected to only the control gate the correspond first and second transistor, whereby the number of output generation stages active in boosting the output is automatically adjusted based upon said output of the charge pump.