Patent ID: 6064251
Filing Date: 2000-05-16
Classification: H02M

Abstract:
A charge pump system fabricated on a substrate comprising:a first plurality of charge pumps, said first plurality of charge pumps coupled in series, each of said first plurality of charge pumps having a plurality of clock terminals coupled to respective ones of a first set of at least four distinct clock signals, each clock signal of said first set of clock signals having a first logic high level; anda second plurality of charge pumps, said second plurality of charge pumps coupled in series, a first output terminal of a one of said first plurality of charge pumps, coupled in series to a second input terminal of a one of said second plurality of charge pumps, each of said second plurality of charge pumps having a plurality of clock terminals coupled to respective ones of a second set of at least four distinct clock signals, each clock signal of said second set of clock signals having a second logic high level;whereinsaid first plurality of charge pumps are clocked only by said first set of clock signals and said second plurality of charge pumps are clocked only by said second set of clock signals; andsaid second logic high level is greater than said first logic high level so as to enable said second plurality of charge pumps to provide an output voltage at each of said second output terminals that is greater than a voltage at the first output terminal of said one of said first plurality of charge pumps.