Patent ID: 7675350

Claim:
A VPP voltage generator comprising: an enable control circuit configured to generate an enable control signal by comparing an output of the VPP voltage generator with a first reference voltage; an oscillator circuit for generating a pumping control signal in response to the enable control signal; a pumping circuit for performing a charge pumping operation in response to the pumping control signal, thus generating a VPP voltage which is the output of the VPP voltage generator; a VPP voltage detector for outputting first and second detection signals by comparing the VPP voltage with a second reference voltage; a first cycle control circuit for outputting a first cycle control signal and a second cycle control signal for decreasing a cycle of the pumping control signal in response to the first detection signal; and a second cycle control circuit for outputting a third cycle control signal and a fourth cycle control signal for increasing a cycle of the pumping control signal in response to the second detection signal.