Patent ID: 7623394

Claim:
A high voltage generator of a semiconductor device, comprising: a first high voltage pump unit to generate a first high voltage in response to a first clock signal generated according to an oscillator enable signal output from a clock encoder; a second high voltage pump unit to generate a second high voltage in response to a second clock signal generated according to the oscillator enable signal; and a clock generating unit to compare an output voltage of the first high voltage pump unit and a reference voltage, and compare a first enable signal according to the comparison result, an output voltage of the second high voltage pump unit, and the reference voltage, and generate the first clock signal and the second clock signal in response to a second enable signal according to the comparison result, wherein the clock generating unit comprises the clock encoder for encoding the first enable signal and the second enable signal and generating the oscillator enable signal, and an oscillator for generating the first clock signal and the second signal according to the oscillator enable signal.