Using the Non-linear Behavior of the Brokaw Bandgap Voltage Reference Cell to Linearize Resistance Temperature Detectors (RTD)
Resistance temperature detectors (RTD) present second and third order non-linearities, and a linear signal processing circuit which converts the voltage on a Pt-100 RTD to an output voltage with 10 mV/oC presents a maximum non-linearity error of 1.07 oC (10.7 mV) in the 0 to 85 oC temperature range....
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IFSA Publishing, S.L.
2019-01-01
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| Series: | Sensors & Transducers |
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| Online Access: | https://sensorsportal.com/HTML/DIGEST/january_2019/Vol_229/P_3058.pdf |
| _version_ | 1797776402649448448 |
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| author | Pedro Carvalhaes-Dias Ivan P. Ferreira Luίs F. C. Duarte Flávio J. O. Morais |
| author_facet | Pedro Carvalhaes-Dias Ivan P. Ferreira Luίs F. C. Duarte Flávio J. O. Morais |
| author_sort | Pedro Carvalhaes-Dias |
| collection | DOAJ |
| description | Resistance temperature detectors (RTD) present second and third order non-linearities, and a linear signal processing circuit which converts the voltage on a Pt-100 RTD to an output voltage with 10 mV/oC presents a maximum non-linearity error of 1.07 oC (10.7 mV) in the 0 to 85 oC temperature range. These non-linearities can be corrected digitally, but there are applications where a simple analog linearization can be used with advantages, as in the case of a direct interface of an RTD sensor with a 4-20 mA current loop transducer. The intrinsic curvature of the Brokaw bandgap voltage reference cell, caused by the non- linear variation of the bipolar transistor's VBE with temperature, can be used to create a compensation voltage that can be used to reduce the non-linearity of the signal processing circuit of resistance temperature. A discrete Brokaw bandgap reference cell using a bipolar analog array LM3046 and a high precision op-amp was designed, and the calculated values of the final circuit indicate that the non-linearity of the signal conditioning circuit of a Pt-100 RTD is reduced by one order of magnitude (down to approximately 0.14 oC) in the 0-85 oC temperature range. |
| first_indexed | 2024-03-12T22:49:25Z |
| format | Article |
| id | doaj.art-c7bf8351298f4285a647690e9ee1c53a |
| institution | Directory Open Access Journal |
| issn | 2306-8515 1726-5479 |
| language | English |
| last_indexed | 2024-03-12T22:49:25Z |
| publishDate | 2019-01-01 |
| publisher | IFSA Publishing, S.L. |
| record_format | Article |
| series | Sensors & Transducers |
| spelling | doaj.art-c7bf8351298f4285a647690e9ee1c53a2023-07-20T15:45:51ZengIFSA Publishing, S.L.Sensors & Transducers2306-85151726-54792019-01-0122916167Using the Non-linear Behavior of the Brokaw Bandgap Voltage Reference Cell to Linearize Resistance Temperature Detectors (RTD)Pedro Carvalhaes-Dias0Ivan P. Ferreira1Luίs F. C. Duarte2Flávio J. O. Morais3Paraná Federal University of TechnologyDepartment of Semiconductors, Instrumentation and Photonics, School of Electrical and Computer Engineering - UnicampParaná Federal University of TechnologyFaculty of Sciences and Engineering, UNESPResistance temperature detectors (RTD) present second and third order non-linearities, and a linear signal processing circuit which converts the voltage on a Pt-100 RTD to an output voltage with 10 mV/oC presents a maximum non-linearity error of 1.07 oC (10.7 mV) in the 0 to 85 oC temperature range. These non-linearities can be corrected digitally, but there are applications where a simple analog linearization can be used with advantages, as in the case of a direct interface of an RTD sensor with a 4-20 mA current loop transducer. The intrinsic curvature of the Brokaw bandgap voltage reference cell, caused by the non- linear variation of the bipolar transistor's VBE with temperature, can be used to create a compensation voltage that can be used to reduce the non-linearity of the signal processing circuit of resistance temperature. A discrete Brokaw bandgap reference cell using a bipolar analog array LM3046 and a high precision op-amp was designed, and the calculated values of the final circuit indicate that the non-linearity of the signal conditioning circuit of a Pt-100 RTD is reduced by one order of magnitude (down to approximately 0.14 oC) in the 0-85 oC temperature range.https://sensorsportal.com/HTML/DIGEST/january_2019/Vol_229/P_3058.pdfrtdbandgap curvaturebrokaw celllinearizationtemperature sensors |
| spellingShingle | Pedro Carvalhaes-Dias Ivan P. Ferreira Luίs F. C. Duarte Flávio J. O. Morais Using the Non-linear Behavior of the Brokaw Bandgap Voltage Reference Cell to Linearize Resistance Temperature Detectors (RTD) Sensors & Transducers rtd bandgap curvature brokaw cell linearization temperature sensors |
| title | Using the Non-linear Behavior of the Brokaw Bandgap Voltage Reference Cell to Linearize Resistance Temperature Detectors (RTD) |
| title_full | Using the Non-linear Behavior of the Brokaw Bandgap Voltage Reference Cell to Linearize Resistance Temperature Detectors (RTD) |
| title_fullStr | Using the Non-linear Behavior of the Brokaw Bandgap Voltage Reference Cell to Linearize Resistance Temperature Detectors (RTD) |
| title_full_unstemmed | Using the Non-linear Behavior of the Brokaw Bandgap Voltage Reference Cell to Linearize Resistance Temperature Detectors (RTD) |
| title_short | Using the Non-linear Behavior of the Brokaw Bandgap Voltage Reference Cell to Linearize Resistance Temperature Detectors (RTD) |
| title_sort | using the non linear behavior of the brokaw bandgap voltage reference cell to linearize resistance temperature detectors rtd |
| topic | rtd bandgap curvature brokaw cell linearization temperature sensors |
| url | https://sensorsportal.com/HTML/DIGEST/january_2019/Vol_229/P_3058.pdf |
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