Patent ID: 7482856
Filing Date: 2009-01-27
Classification: H02M

Abstract:
1. A VPP voltage generator comprising: an oscillator circuit that periodically generates a pumping control signal of a pulse form based on an oscillation cycle according to first and second cycle control signals, the oscillator circuit being enabled in response to an enable control signal; a pumping circuit that performs a charge pumping operation in response to the pumping control signal, thus generating a VPP voltage; a VPP voltage detector that detects the level of the VPP voltage and outputs first and second detection signals according to the detection result; a cycle control circuit that outputs the first and second cycle control signals to the oscillator circuit and is configured to control the oscillation cycle in response to the first and second detection signals, wherein the cycle control circuit includes: a first control logic circuit that outputs the first cycle control signal and an inverted first cycle control signal in response to the first detection signal; and a second control logic circuit that outputs the second cycle control signal and an inverted second cycle control signal in response to the second detection signal; and an enable control circuit that compares the VPP voltage with a reference voltage and generates the enable control signal according to the comparison result, in response to a word line activation signal.