A Capacitive Pressure Sensor Interface IC with Wireless Power and Data Transfer
This paper presents a capacitive pressure sensor interface circuit design in 180 nm XH018 CMOS technology for an implantable capacitive pressure sensor, which has a wireless power supply and wireless data transfer function. It integrates full-bridge rectifiers, shorting control switches, low-dropout...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-09-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/11/10/897 |
| _version_ | 1827705260762726400 |
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| author | Chaoping Zhang Robert Gallichan David M. Budgett Daniel McCormick |
| author_facet | Chaoping Zhang Robert Gallichan David M. Budgett Daniel McCormick |
| author_sort | Chaoping Zhang |
| collection | DOAJ |
| description | This paper presents a capacitive pressure sensor interface circuit design in 180 nm XH018 CMOS technology for an implantable capacitive pressure sensor, which has a wireless power supply and wireless data transfer function. It integrates full-bridge rectifiers, shorting control switches, low-dropout regulators, bandgap references, analog front end, single slope analog to digital converter (ADC), I2C, and an RC oscillator. The low-dropout regulators regulate the wireless power supply coming from the rectifier and provide a stable and accurate 1.8 V DC voltage to other blocks. The capacitance of the pressure sensor is sampled to a discrete voltage by the analog front end. The single slope ADC converts the discrete voltage into 11 bits of digital data, which is then converted into 1 kbps serial data out by the I2C block. The “1” of serial data is modulated to a 500 kHz digital signal that is used to control the shorting switch for wireless data transfer via inductive back scatter. This capacitive pressure sensor interface IC has a resolution of 0.98 mmHg (1.4 fF), average total power consumption of 7.8 mW, and ±3.2% accuracy at the worst case under a −20 to 80 °C temperature range, which improves to ±0.86% when operated between 20 and 60 °C. |
| first_indexed | 2024-03-10T15:59:41Z |
| format | Article |
| id | doaj.art-5616ea409bce4fdaa5f8de10cea0415b |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-10T15:59:41Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-5616ea409bce4fdaa5f8de10cea0415b2023-11-20T15:20:21ZengMDPI AGMicromachines2072-666X2020-09-01111089710.3390/mi11100897A Capacitive Pressure Sensor Interface IC with Wireless Power and Data TransferChaoping Zhang0Robert Gallichan1David M. Budgett2Daniel McCormick3Auckland Bioengineering Institute, The University of Auckland, Auckland 1010, New ZealandAuckland Bioengineering Institute, The University of Auckland, Auckland 1010, New ZealandAuckland Bioengineering Institute, The University of Auckland, Auckland 1010, New ZealandAuckland Bioengineering Institute, The University of Auckland, Auckland 1010, New ZealandThis paper presents a capacitive pressure sensor interface circuit design in 180 nm XH018 CMOS technology for an implantable capacitive pressure sensor, which has a wireless power supply and wireless data transfer function. It integrates full-bridge rectifiers, shorting control switches, low-dropout regulators, bandgap references, analog front end, single slope analog to digital converter (ADC), I2C, and an RC oscillator. The low-dropout regulators regulate the wireless power supply coming from the rectifier and provide a stable and accurate 1.8 V DC voltage to other blocks. The capacitance of the pressure sensor is sampled to a discrete voltage by the analog front end. The single slope ADC converts the discrete voltage into 11 bits of digital data, which is then converted into 1 kbps serial data out by the I2C block. The “1” of serial data is modulated to a 500 kHz digital signal that is used to control the shorting switch for wireless data transfer via inductive back scatter. This capacitive pressure sensor interface IC has a resolution of 0.98 mmHg (1.4 fF), average total power consumption of 7.8 mW, and ±3.2% accuracy at the worst case under a −20 to 80 °C temperature range, which improves to ±0.86% when operated between 20 and 60 °C.https://www.mdpi.com/2072-666X/11/10/897AFEADCBGRLDOoscillatorrectifier |
| spellingShingle | Chaoping Zhang Robert Gallichan David M. Budgett Daniel McCormick A Capacitive Pressure Sensor Interface IC with Wireless Power and Data Transfer Micromachines AFE ADC BGR LDO oscillator rectifier |
| title | A Capacitive Pressure Sensor Interface IC with Wireless Power and Data Transfer |
| title_full | A Capacitive Pressure Sensor Interface IC with Wireless Power and Data Transfer |
| title_fullStr | A Capacitive Pressure Sensor Interface IC with Wireless Power and Data Transfer |
| title_full_unstemmed | A Capacitive Pressure Sensor Interface IC with Wireless Power and Data Transfer |
| title_short | A Capacitive Pressure Sensor Interface IC with Wireless Power and Data Transfer |
| title_sort | capacitive pressure sensor interface ic with wireless power and data transfer |
| topic | AFE ADC BGR LDO oscillator rectifier |
| url | https://www.mdpi.com/2072-666X/11/10/897 |
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