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Apparatus and method for interfacing time-variant signals

  • US 7,317,409 B2
  • Filed: 01/30/2002
  • Issued: 01/08/2008
  • Est. Priority Date: 01/30/2002
  • Status: Expired due to Term
First Claim
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1. A circuit adapted for use with a digital pressure sensing apparatus and a monitoring device, and further adapted to generate an emulation of the output of an analog pressure sensing apparatus compatible with said monitoring device, said emulation being based at least on (i) digital inputs received from said digital sensing apparatus and (ii) an excitation signal produced by said monitoring device, the circuit comprising:

  • a digital-to-analog converter (DAC) configured to receive digital inputs generated by said digital sensing apparatus, said DAC adapted to produce an analog output signal using at least said digital inputs; and

    at least one amplifier operatively coupled to the output of said DAC;

    wherein said at least one amplifier is configured to produce an output voltage which is substantially ratio-metric with said excitation voltage; and

    wherein said circuit is adapted to generate said emulation by using said excitation signal as a reference input to said DAC.

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