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NOVEL SINGLE SUPPLY LEVEL SHIFTER CIRCUIT FOR MULTI-VOLTAGE DESIGNS, CAPABLE OF UP/DOWN SHIFTING

  • US 20100019825A1
  • Filed: 07/25/2008
  • Published: 01/28/2010
  • Est. Priority Date: 07/25/2008
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a first circuit;

    a second circuit;

    a voltage source with an output voltage equal to a voltage value of the second circuit;

    a level shifter circuit coupled with both an output of the first circuit and an output of the voltage source and wherein the level shifter circuit is used to convert the voltage value of a signal from the first circuit to the voltage value of the second circuit; and

    a capacitor loop circuit associated with the first circuit, the level shifter circuit and the voltage source and configured with a capacitor to charge from at least one of a first circuit output voltage and a voltage source output voltage and to discharge into a specified node of the level shifter circuit when an output signal of the first circuit is at a logic state low.

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