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Monolithic ratiometric temperature measurement circuit

  • US 5,030,849 A
  • Filed: 06/30/1989
  • Issued: 07/09/1991
  • Est. Priority Date: 06/30/1989
  • Status: Expired due to Term
First Claim
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1. In a signal conditioning circuit to be powered from a supply voltage, and including a resistance temperature detector (RTD) whose resistance varies approximately proportionally to temperature and means for deriving from the RTD an output signal varying linearly with the RTD temperature, said means further including means connected to receive the supply voltage, for applying to the RTD a current drive signal and means for providing an output voltage as a function of the voltage developed across the RTD, the improvement comprising:

  • the means for applying a current drive signal to the RTD being adapted to apply thereto a drive signal which varies linearly with supply voltage and temperature but is offset from zero at a predetermined temperature, said means being adapted to be calibrated at a single temperature to produce said linear variation.

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