Patent ID: 7642837

Claim:
An internal voltage generation circuit of a semiconductor device, comprising: a voltage detecting unit configured to detect a voltage level of an internal voltage output terminal to output a voltage detection signal; an oscillating unit configured to generate a first oscillation signal having a predefined frequency in response to the voltage detection signal; and a pumping unit configured to perform a charge pumping operation in response to the first oscillation signal and the voltage detection signal to output an internal voltage to the internal voltage output terminal, wherein the pumping unit comprises: a first oscillation period driver configured to drive a second oscillation signal by receiving the first oscillation signal and the voltage detection signal; a pumping controller configured to generate a first pumping control signal in response to the second oscillation signal; a second oscillation period driver configured to drive a second pumping control signal by receiving the first pumping control signal and the voltage detection signal; and a charge pump configured to perform a charge pumping operation in response to the second pumping control signal to output the internal voltage to the internal voltage output terminal.