@inproceedings{6fa5f19f9883432e8005fedf606df0fe,
title = "A differential p-ISFET based on-chip pH sensor with substrate based drift reset capability",
abstract = "This paper presents a monolithic, inexpensive, label free, robust pH sensor that can be fabricated in an unmodified CMOS process. The sensor uses a differential p-ISFET architecture which substantially reduces non-ideal common mode effects which corrupt readout in ISFET based pH sensors and occupy only a small footprint. Additionally, the design offers the capability to correct for drift through control of the n-well voltage, which has not been demonstrated previously. We present results obtained from testing the sensor that is fabricated in the AMS 0.35m process, including a demonstration of the drift correction. We demonstrate a differential sensitivity of 15 mV/pH over the entire pH range, with the ability to remove the already small drift of 0.1 mV/min using the bulk-source voltage adjustment.",
keywords = "CMOS sensor, ISFET, biosensor, chemical sensor, differential p-ISFET, drift cancellation, lab-on-chip, noise cancellation, pH sensor",
author = "Vaishak Prathap and Titus, \{Albert H.\}",
note = "Publisher Copyright: {\textcopyright} 2021 IEEE.; 20th IEEE Sensors, SENSORS 2021 ; Conference date: 31-10-2021 Through 04-11-2021",
year = "2021",
doi = "10.1109/SENSORS47087.2021.9639844",
language = "English",
series = "Proceedings of IEEE Sensors",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
booktitle = "2021 IEEE Sensors, SENSORS 2021 - Conference Proceedings",
address = "United States",
}