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Internal voltage generating circuit

  • US 7,782,120 B2
  • Filed: 03/19/2008
  • Issued: 08/24/2010
  • Est. Priority Date: 10/04/2007
  • Status: Expired due to Fees
First Claim
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1. An internal voltage generating circuit for pumping charge to generate an internal driving voltage, comprising:

  • a first oscillation signal generating unit that provides a first oscillation signal in response to a detected internal voltage and a predetermined test mode signal, the first oscillation signal having a first period;

    a second oscillation signal generating unit that divides an external clock to provide a second oscillation signal having a variable oscillation period, the second oscillation signal having a second period that is different from the first period; and

    a switching unit that selects an output from the first oscillation signal or the second oscillation signal in response to the predetermined test mode signal and provides the selected signal as a pumping period signal.

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