A Highly Linear, AEC-Q100 Compliant Signal Conditioning IC for Automotive Piezo-Resistive Pressure Sensors
| Autor: | Youngoo Yang Youngoo, Minjae Lee, YoungGun Pu, Dong-Soo Lee, Sang-Sun Yoo, Keum Cheol Hwang, Ho-Cheol Ryu, Sung-Hun Cho, Kang-Yoon Lee |
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| Rok vydání: | 2018 |
| Předmět: |
Computer science
Hardware_PERFORMANCEANDRELIABILITY 02 engineering and technology Integrated circuit 01 natural sciences Electromagnetic interference law.invention law Hardware_INTEGRATEDCIRCUITS 0202 electrical engineering electronic engineering information engineering Digital signal Electrical and Electronic Engineering Signal conditioning Electronic circuit business.industry 020208 electrical & electronic engineering 010401 analytical chemistry Electrical engineering Linearity Pressure sensor 0104 chemical sciences Analog signal CMOS Control and Systems Engineering business Voltage |
| Zdroj: | IEEE Transactions on Industrial Electronics. 65:7363-7373 |
| ISSN: | 1557-9948 0278-0046 |
| Popis: | In this paper, the design of a signal conditioning analog front-end (AFE) IC for an automotive piezo-resistive type pressure sensor is presented. To improve the pressure-sensing accuracy and compensate for variations in the pressure sensor and signal conditioning IC, gauge factor calibration, digital automatic offset, and gain calibration are proposed and implemented with low power consumption. By using a high-resolution analog-to-digital converter and digital-to-analog converter, the digital automatic calibration circuit can guarantee linearity of output voltage with respect to pressure to within 0.5%. As the analog signal is converted to a digital signal, accuracy in the AFE IC improves. To improve the reliability in the automotive environment, over-voltage and reverse-voltage protection circuits are integrated with the electrostatic discharge protection circuit. Also, electromagnetic interference is reduced by using the proposed spread spectrum clock generator. The proposed design is implemented using 2P4M 0.35 μm CMOS technology with an active area of 1.94 mm × 1.94 mm. Full output ranges from 0.5 to 4.5 V. The ratiometricity error is within ±0.25% when the supply voltage is changed by ±10%. Current consumption is 4.7 mA from a 5 V supply. The output accuracy is within ±0.5% with respect to the PVT variations. |
| Databáze: | OpenAIRE |
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