Patent ID: 7315195

Claim:
A high voltage-generating circuit, comprising: a control circuit for generating a refresh signal depending upon a refresh operation command from an external chipset; an oscillator driven according to a control signal and for outputting an oscillation signal, in which a cycle of the oscillation signal is controlled by the refresh signal; a charge pump circuit for generating a high voltage using a power source voltage according to the oscillation signal, wherein the charge pump circuit has the ascent rate of the high voltage controlled according to variation in the cycle of the oscillation signal; and a level detection circuit for comparing the high voltage and a reference voltage to determine whether the high voltage reaches a target value, and for outputting the control signal according to a result of the comparison, wherein the oscillator comprises: a first logic unit for outputting an output signal in response to the control signal and a signal of an output node; two or more delay units for delaying the output signal from the logic unit; two or more switching units respectively connected between the two or more delay units and the output node and respectively controlled by the refresh signal; and a second logic unit for inputting the signal of the output node and for outputting the oscillation signal.