Patent ID: 8633759
Filing Date: 2014-01-21
Classification: H02M

Abstract:
1. A voltage generator, comprising: a clock generator configured to generate a first clock signal and a second clock signal having a longer cycle than the first clock signal; a pumping unit configured to generate a pumping voltage in response to the first or second clock signal; a first detection circuit configured to detect the pumping voltage and generate a first control signal for controlling an operation of the pumping unit based on a result of the detection; and a second detection circuit configured to generate a second control signal for outputting the first or second clock signal generated from the clock generator depending on whether the first control signal maintains an enable state for a specific time, the second detection circuit comprising: a first switching element coupled to a power source voltage terminal and configured to operate in response to an inverted signal of a pump enable signal; a second switching element coupled to the first switching element and configured to operate in response to the first control signal; a latch configured to have an input terminal coupled to the second switching element; a first delay circuit configured to delay a rising edge of the first control signal for the specific time; a third switching element coupled between a ground terminal and the input terminal of the latch and configured to operate in response to an output signal of the first delay circuit; and a logical conjunction element configured to generate the second control signal in response to the pump enable signal and the output signal of the latch.