Patent ID: 6018264
Filing Date: 2000-01-25
Classification: H02M

Abstract:
A pumping circuit for a semiconductor device, comprising:a first comparator for comparing an internal voltage supplied to an internal circuit of a semiconductor memory device with a level of a first reference voltage;an oscillator for outputting a pulse signal in accordance with an output signal from said first comparator;a second comparator for being enabled in accordance with an output signal from said first comparator and comparing a level of the internal voltage with a level of a second reference voltage;a driving unit for outputting a swing width of a pumping enable signal in accordance with a logic state of said pulse signal from the oscillator and a logic state of an output signal from said second comparator; anda pumping unit for pumping an external voltage based on the level of said pumping enable signal,wherein said pumped voltage is supplied to said internal circuit of said semiconductor memory device as said internal voltage and is fed back to said first comparator and said second comparator.