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FULLY_LINEAR_DIODE_SENSOR_

2017-03-15 19:33  
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FULLY_LINEAR_DIODE_SENSOR_
First opamp acts as constant-current source for temperature-sensing diode, making voltage drop across diode depend only on temperature. Second opamp offsets diode voltage to whatever temperature range is desired and provides gain that is adjustable with R6. R4, is used to set output at zero for selected temperature such as for 0℃. Circuit can then be adjusted to give 1 V at 50℃.-C. J. Koch, Diode or Transistor Makes Fully Linear Thermometer, Electronics, May 13, 1976, p 110-112.