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@article{Goh:2011:10.1109/JSEN.2011.2155644,
author = {Goh, ZDC and Georgiou, P and Constandinou, TG and Prodromakis, T and Toumazou, C},
doi = {10.1109/JSEN.2011.2155644},
journal = {IEEE Sensors Journal},
pages = {3253--3260},
title = {A CMOS-based ISFET Chemical Imager with Auto-Calibration Capability},
url = {http://dx.doi.org/10.1109/JSEN.2011.2155644},
volume = {11},
year = {2011}
}

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TY  - JOUR
AB  - This paper presents a novel auto-calibration technique for eliminating sensor mismatch in CMOS-based chemical imagers. Designed using an 8x8 array comprising of pH sensitive Ion Sensitive Field Effect Transistors (ISFETs), the chemical imager is capable of implementing a gradient based calibration algorithm by biasing programmable-gate (PG) ISFETs at a common operating point when exposed to a solution of homogenous pH. The system was fabricated in a typical 0.35um CMOS technology and demonstrated a fast rate of convergence (500ms per iteration) while a convergence accuracy of 45mV on a gain of 10 (0.5% relative standard error and 2% pixel-to-pixel variation) was achieved. A maximum pH sensitivity of 57mV/pH is also reported.
AU  - Goh,ZDC
AU  - Georgiou,P
AU  - Constandinou,TG
AU  - Prodromakis,T
AU  - Toumazou,C
DO  - 10.1109/JSEN.2011.2155644
EP  - 3260
PY  - 2011///
SN  - 1530-437X
SP  - 3253
TI  - A CMOS-based ISFET Chemical Imager with Auto-Calibration Capability
T2  - IEEE Sensors Journal
UR  - http://dx.doi.org/10.1109/JSEN.2011.2155644
UR  - http://hdl.handle.net/10044/1/10980
UR  - http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5770163
VL  - 11
ER  -

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