A Highly Accurate, Polynomial-Based Digital Temperature Compensation for Piezoresistive Pressure Sensor in 180 nm CMOS Technology

Recently, piezoresistive-type (PRT) pressure sensors have been gaining attention in variety of applications due to their simplicity, low cost, miniature size and ruggedness. The electrical behavior of a pressure sensor is highly dependent on the temperature gradient which seriously degrades its reli...

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Main Authors: Imran Ali, Muhammad Asif, Khuram Shehzad, Muhammad Riaz Ur Rehman, Dong Gyu Kim, Behnam Samadpoor Rikan, YoungGun Pu, Sang Sun Yoo, Kang-Yoon Lee
Format: Article
Language:English
Published: MDPI AG 2020-09-01
Series:Sensors
Subjects:
Online Access:https://www.mdpi.com/1424-8220/20/18/5256
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spelling doaj-855c54b4c69148839ea44253308c09332020-11-25T01:55:10ZengMDPI AGSensors1424-82202020-09-01205256525610.3390/s20185256A Highly Accurate, Polynomial-Based Digital Temperature Compensation for Piezoresistive Pressure Sensor in 180 nm CMOS TechnologyImran Ali0Muhammad Asif1Khuram Shehzad2Muhammad Riaz Ur Rehman3Dong Gyu Kim4Behnam Samadpoor Rikan5YoungGun Pu6Sang Sun Yoo7Kang-Yoon Lee8College of Information and Communication Engineering, Sungkyunkwan University (SKKU), Suwon 16419, KoreaCollege of Information and Communication Engineering, Sungkyunkwan University (SKKU), Suwon 16419, KoreaCollege of Information and Communication Engineering, Sungkyunkwan University (SKKU), Suwon 16419, KoreaCollege of Information and Communication Engineering, Sungkyunkwan University (SKKU), Suwon 16419, KoreaCollege of Information and Communication Engineering, Sungkyunkwan University (SKKU), Suwon 16419, KoreaCollege of Information and Communication Engineering, Sungkyunkwan University (SKKU), Suwon 16419, KoreaCollege of Information and Communication Engineering, Sungkyunkwan University (SKKU), Suwon 16419, KoreaCollege of Information and Communication Engineering, Sungkyunkwan University (SKKU), Suwon 16419, KoreaCollege of Information and Communication Engineering, Sungkyunkwan University (SKKU), Suwon 16419, KoreaRecently, piezoresistive-type (PRT) pressure sensors have been gaining attention in variety of applications due to their simplicity, low cost, miniature size and ruggedness. The electrical behavior of a pressure sensor is highly dependent on the temperature gradient which seriously degrades its reliability and reduces measurement accuracy. In this paper, polynomial-based adaptive digital temperature compensation is presented for automotive piezoresistive pressure sensor applications. The non-linear temperature dependency of a pressure sensor is accurately compensated for by incorporating opposite characteristics of the pressure sensor as a function of temperature. The compensation polynomial is fully implemented in a digital system and a scaling technique is introduced to enhance its accuracy. The resource sharing technique is adopted for minimizing controller area and power consumption. The negative temperature coefficient (NTC) instead of proportional to absolute temperature (PTAT) or complementary to absolute temperature (CTAT) is used as the temperature-sensing element since it offers the best temperature characteristics for grade 0 ambient temperature operating range according to the automotive electronics council (AEC) test qualification ACE-Q100. The shared structure approach uses an existing analog signal conditioning path, composed of a programmable gain amplifier (PGA) and an analog-to-digital converter (ADC). For improving the accuracy over wide range of temperature, a high-resolution sigma-delta ADC is integrated. The measured temperature compensation accuracy is within ±0.068% with full scale when temperature varies from −40 °C to 150 °C according to ACE-Q100. It takes 37 µs to compute the temperature compensation with a clock frequency of 10 MHz. The proposed technique is integrated in an automotive pressure sensor signal conditioning chip using a 180 nm complementary metal–oxide–semiconductor (CMOS) process.https://www.mdpi.com/1424-8220/20/18/5256temperature compensationdigital controllerpiezoresistivepressure sensornegative temperature coefficientACE-Q100
collection DOAJ
language English
format Article
sources DOAJ
author Imran Ali
Muhammad Asif
Khuram Shehzad
Muhammad Riaz Ur Rehman
Dong Gyu Kim
Behnam Samadpoor Rikan
YoungGun Pu
Sang Sun Yoo
Kang-Yoon Lee
spellingShingle Imran Ali
Muhammad Asif
Khuram Shehzad
Muhammad Riaz Ur Rehman
Dong Gyu Kim
Behnam Samadpoor Rikan
YoungGun Pu
Sang Sun Yoo
Kang-Yoon Lee
A Highly Accurate, Polynomial-Based Digital Temperature Compensation for Piezoresistive Pressure Sensor in 180 nm CMOS Technology
Sensors
temperature compensation
digital controller
piezoresistive
pressure sensor
negative temperature coefficient
ACE-Q100
author_facet Imran Ali
Muhammad Asif
Khuram Shehzad
Muhammad Riaz Ur Rehman
Dong Gyu Kim
Behnam Samadpoor Rikan
YoungGun Pu
Sang Sun Yoo
Kang-Yoon Lee
author_sort Imran Ali
title A Highly Accurate, Polynomial-Based Digital Temperature Compensation for Piezoresistive Pressure Sensor in 180 nm CMOS Technology
title_short A Highly Accurate, Polynomial-Based Digital Temperature Compensation for Piezoresistive Pressure Sensor in 180 nm CMOS Technology
title_full A Highly Accurate, Polynomial-Based Digital Temperature Compensation for Piezoresistive Pressure Sensor in 180 nm CMOS Technology
title_fullStr A Highly Accurate, Polynomial-Based Digital Temperature Compensation for Piezoresistive Pressure Sensor in 180 nm CMOS Technology
title_full_unstemmed A Highly Accurate, Polynomial-Based Digital Temperature Compensation for Piezoresistive Pressure Sensor in 180 nm CMOS Technology
title_sort highly accurate, polynomial-based digital temperature compensation for piezoresistive pressure sensor in 180 nm cmos technology
publisher MDPI AG
series Sensors
issn 1424-8220
publishDate 2020-09-01
description Recently, piezoresistive-type (PRT) pressure sensors have been gaining attention in variety of applications due to their simplicity, low cost, miniature size and ruggedness. The electrical behavior of a pressure sensor is highly dependent on the temperature gradient which seriously degrades its reliability and reduces measurement accuracy. In this paper, polynomial-based adaptive digital temperature compensation is presented for automotive piezoresistive pressure sensor applications. The non-linear temperature dependency of a pressure sensor is accurately compensated for by incorporating opposite characteristics of the pressure sensor as a function of temperature. The compensation polynomial is fully implemented in a digital system and a scaling technique is introduced to enhance its accuracy. The resource sharing technique is adopted for minimizing controller area and power consumption. The negative temperature coefficient (NTC) instead of proportional to absolute temperature (PTAT) or complementary to absolute temperature (CTAT) is used as the temperature-sensing element since it offers the best temperature characteristics for grade 0 ambient temperature operating range according to the automotive electronics council (AEC) test qualification ACE-Q100. The shared structure approach uses an existing analog signal conditioning path, composed of a programmable gain amplifier (PGA) and an analog-to-digital converter (ADC). For improving the accuracy over wide range of temperature, a high-resolution sigma-delta ADC is integrated. The measured temperature compensation accuracy is within ±0.068% with full scale when temperature varies from −40 °C to 150 °C according to ACE-Q100. It takes 37 µs to compute the temperature compensation with a clock frequency of 10 MHz. The proposed technique is integrated in an automotive pressure sensor signal conditioning chip using a 180 nm complementary metal–oxide–semiconductor (CMOS) process.
topic temperature compensation
digital controller
piezoresistive
pressure sensor
negative temperature coefficient
ACE-Q100
url https://www.mdpi.com/1424-8220/20/18/5256
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