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High voltage level shifting IC with under-ground voltage swing withstanding capability

  • US 6,967,518 B2
  • Filed: 06/12/2003
  • Issued: 11/22/2005
  • Est. Priority Date: 06/12/2002
  • Status: Expired due to Term
First Claim
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1. A device operable to transfer an input signal between differently referenced circuits, comprising:

  • an input circuit referenced to a first voltage reference and operable to provide the input signal;

    a receiving device coupled to receive the input signal from the input circuit;

    a biasing circuit coupled to the receiving device to provide a biasing voltage reference for the receiving device;

    a first level shifter coupled to the input circuit and the receiving device for translating the input signal so it is referenced to the bias voltage;

    an output circuit referenced to a second voltage reference; and

    a second level shifter coupled to receive the translated input signal and to provide the translated input signal to the output circuit, whereby an output signal is provided which is related to the input signal and referenced to the second voltage reference.

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