A 7 μW Offset- and Temperature-Compensated pH-to-Digital Converter
Joint Authors
Heidary Shalmany, Saleh
Merz, Matthias
Fekri, Ali
Chang, Zu-yao
Hoofman, Romano J. O. M.
Pertijs, Michiel A. P.
Source
Issue
Vol. 2017, Issue 2017 (31 Dec. 2017), pp.1-8, 8 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2017-01-29
Country of Publication
Egypt
No. of Pages
8
Main Subjects
Abstract EN
This paper demonstrates a micropower offset- and temperature-compensated smart pH sensor, intended for use in battery-powered RFID systems that monitor the quality of perishable products.
Low operation power is essential in such systems to enable autonomous logging of environmental parameters, such as the pH level, over extended periods of time using only a small, low-cost battery.
The pH-sensing element in this work is an ion-sensitive extended-gate field-effect transistor (EGFET), which is incorporated in a low-power sensor front-end.
The front-end outputs a pH-dependent voltage, which is then digitized by means of a co-integrated incremental delta-sigma ADC.
To compensate for the offset and temperature cross-sensitivity of the EGFET, a compensation scheme using a calibration process and a temperature sensor has been devised.
A prototype chip has been realized in a 0.16 μm CMOS process.
It occupies 0.35 × 3.9 mm2 of die area and draws only 4 μA from a 1.8 V supply.
Two different types of custom packaging have been used for measurement purposes.
The pH sensor achieves a linearity of better than ±0.1 for pH values ranging from 4 to 10.
The calibration and compensation scheme reduces errors due to temperature cross-sensitivity to less than ±0.1 in the temperature range of 6°C to 25°C.
American Psychological Association (APA)
Heidary Shalmany, Saleh& Merz, Matthias& Fekri, Ali& Chang, Zu-yao& Hoofman, Romano J. O. M.& Pertijs, Michiel A. P.. 2017. A 7 μW Offset- and Temperature-Compensated pH-to-Digital Converter. Journal of Sensors،Vol. 2017, no. 2017, pp.1-8.
https://search.emarefa.net/detail/BIM-1187137
Modern Language Association (MLA)
Heidary Shalmany, Saleh…[et al.]. A 7 μW Offset- and Temperature-Compensated pH-to-Digital Converter. Journal of Sensors No. 2017 (2017), pp.1-8.
https://search.emarefa.net/detail/BIM-1187137
American Medical Association (AMA)
Heidary Shalmany, Saleh& Merz, Matthias& Fekri, Ali& Chang, Zu-yao& Hoofman, Romano J. O. M.& Pertijs, Michiel A. P.. A 7 μW Offset- and Temperature-Compensated pH-to-Digital Converter. Journal of Sensors. 2017. Vol. 2017, no. 2017, pp.1-8.
https://search.emarefa.net/detail/BIM-1187137
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1187137