TY - GEN
T1 - A SAR based calibration scheme for ISFET sensing arrays
AU - Hu, Yuanqi
AU - Li, Jiandong
AU - Georgiou, Pantelis
PY - 2014
Y1 - 2014
N2 - This paper presents an automatic calibration system for ISFET chemical sensing arrays to tune out any mismatch in sensitivity. Through exploitation of the high frequency spectrum of the sensed signal which does not contain any chemical reaction information, local sensitivity is examined and then calibrated through a successive approximation control mechanism and an 8-bit variable gain amplifier to provide high accuracy tuning. The total calibration process contains three phases, peak detection, AGC through a SAR and finally sensor readout of the detected chemical signal. Designed in a typical 0.35μm CMOS process, the system is capable of compensating a sensitivity deviation of up to 24% in an ISFET array, constraining the error to just 1.5%.
AB - This paper presents an automatic calibration system for ISFET chemical sensing arrays to tune out any mismatch in sensitivity. Through exploitation of the high frequency spectrum of the sensed signal which does not contain any chemical reaction information, local sensitivity is examined and then calibrated through a successive approximation control mechanism and an 8-bit variable gain amplifier to provide high accuracy tuning. The total calibration process contains three phases, peak detection, AGC through a SAR and finally sensor readout of the detected chemical signal. Designed in a typical 0.35μm CMOS process, the system is capable of compensating a sensitivity deviation of up to 24% in an ISFET array, constraining the error to just 1.5%.
UR - https://www.scopus.com/pages/publications/84907383112
U2 - 10.1109/ISCAS.2014.6865223
DO - 10.1109/ISCAS.2014.6865223
M3 - 会议稿件
AN - SCOPUS:84907383112
SN - 9781479934324
T3 - Proceedings - IEEE International Symposium on Circuits and Systems
SP - 666
EP - 669
BT - 2014 IEEE International Symposium on Circuits and Systems, ISCAS 2014
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2014 IEEE International Symposium on Circuits and Systems, ISCAS 2014
Y2 - 1 June 2014 through 5 June 2014
ER -