Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1974-06-07
1977-01-25
Myracle, Jerry W.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
307310, G01J 500
Patent
active
040044629
ABSTRACT:
A temperature transducer includes a temperature sensor, a voltage regulator connected in parallel with the sensor, and a differential amplifier having one input thereof connected to the output of the sensor. An output of the differential amplifier is connected through an amplifier to an output terminal and a second input to the operational amplifier is disposed for connection to an external circuit or to the output terminal of the transducer. The temperature sensor includes a current inverter connected to a pair of transistors to maintain the ratio of their current densities constant with changes in temperature. The difference of the base-emitter voltages of the transistors operating at different current densities is directly proportional to temperature in degrees Kelvin. This difference of the base-emitter voltages is developed across an output resistor which is connected to an appropriate input of the differential amplifier.
REFERENCES:
patent: 3181364 (1965-05-01), Barton
patent: 3271660 (1966-09-01), Hilbiber
patent: 3383920 (1968-05-01), Greenly
patent: 3421375 (1969-01-01), Dimon
patent: 3503261 (1970-03-01), Riester et al.
patent: 3688581 (1972-09-01), LeQuemec
patent: 3809929 (1974-05-01), Vittoz
patent: 3851241 (1974-11-01), Wheatley
patent: 3882728 (1975-05-01), Wittlinger
Higgins Willis E.
Myracle Jerry W.
National Semiconductor Corporation
Woodward Gail W.
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