Patent ID: 6566847
Filing Date: 2003-05-20
Classification: G05F

Abstract:
A charge pump voltage regulating circuit, comprising:a charge pump circuit having clock inputs and a high voltage output wherein an output voltage is produced at said high voltage output of said charge pump circuit; a detecting circuit having an input and an output wherein said input of said detecting circuit is in electrical communication with said high voltage output of said charge pump circuit, a feedback voltage is produced at said output of said detecting circuit, and said feedback depends on to said output voltage; a first current generator in electrical communication with a primary voltage supply wherein said first current generator produces a constant first current; a second current generator in electrical communication with said first current generator wherein said second current generator has a feedback input in electrical communication with said output of said detecting circuit, said second circuit generator produces a second current, and said second current is controlled by said feedback voltage; an oscillator circuit having a bias current input and clock outputs wherein said bias current input is in electrical communication with said first and second current generators so that a third current equal to said second current subtracted from said first current flows into said bias current input, and each of said clock outputs are in electrical communication with one of said clock inputs of said charge pump circuit; clock signals wherein one of said clock signals is produced at each of said clock outputs of said oscillator circuit, each of said clock signals has the same clock frequency, said clock frequency is controlled by said third current, and said output voltage produced at said high voltage output of said charge pump circuit is controlled by said clock frequency.