Patent ID: 8705273
Filing Date: 2014-04-22
Classification: G11C

Abstract:
1. A nonvolatile memory device comprising: a voltage generator circuit including a high voltage generator configured to generate a high voltage and a negative voltage generator configured to generate a negative voltage and a well voltage; and at least one circuit including at least one switch configured to output one of the high voltage and the well voltage in response to an enable signal for applying the negative voltage to a line corresponding to a word line supplied with the negative voltage, wherein the high voltage generator and the negative voltage generator are configured to generate voltages in response to independent oscillation clocks, respectively, wherein the high voltage generator comprises: a reference voltage generator for a high voltage configured to generate a reference voltage for a high voltage; an oscillator for a high voltage configured to generate a clock for a high voltage; at least one charge pump configured to generate a target high voltage in response to a pump clock for a high voltage; and at least one voltage detector configured to detect the target high voltage based on the reference voltage for a high voltage and the clock for a high voltage and to generate the pump clock corresponding to the detected target high voltage, wherein the at least one voltage detector comprises: a power supply part for a high voltage connected between a power supply terminal and a detection node for a high voltage supplied with the target high voltage and configured to supply a power supply voltage in response to a high voltage enable signal; a voltage dividing part for a high voltage connected between the detection node for a high voltage and a comparison node for a high voltage and configured to voltage divide the target high voltage; a current path forming part for a high voltage connected between the comparison node for a high voltage and a ground terminal and configured to form a current path in response to the high voltage enable signal; a comparison part for a high voltage configured to compare the reference voltage for a high voltage and a voltage of the comparison node for a high voltage and to generate the pump clock for a high voltage corresponding to the comparison; and a control part for a high voltage configured to receive the high voltage enable signal and to activate the power supply part and the current path forming part.