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A cmos-based isfet chemical imager with auto-calibration capability

A cmos-based isfet chemical imager with auto-calibration capability
A cmos-based isfet chemical imager with auto-calibration capability
This paper presents a novel auto-calibration technique for eliminating sensor mismatch in CMOS-based chemical imagers. Designed using an 8 × 8 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 0.35-?m CMOS technology and demonstrated a fast rate of convergence (500 ms per iteration) while a convergence accuracy of 45 mV on a gain of 10 (0.5% relative standard error and 2% pixel-to-pixel variation) was achieved. A maximum pH sensitivity of 57 mV/pH is also reported.
1530-437X
3253-3260
Goh, Clinton Z.D.
6c4ee4d6-aa3c-4dbd-92fc-f8b34b52b91f
Georgiou, Pantelis
90e3a373-77ee-4621-b65d-3f47e3b7895c
Constandinou, Timothy G.
b0b83fd1-3659-43c4-ac6a-308b2330453d
Prodromakis, Themistoklis
d58c9c10-9d25-4d22-b155-06c8437acfbf
Toumazou, Christofer
7a856162-f970-4ef4-8a57-5822d8a69281
Goh, Clinton Z.D.
6c4ee4d6-aa3c-4dbd-92fc-f8b34b52b91f
Georgiou, Pantelis
90e3a373-77ee-4621-b65d-3f47e3b7895c
Constandinou, Timothy G.
b0b83fd1-3659-43c4-ac6a-308b2330453d
Prodromakis, Themistoklis
d58c9c10-9d25-4d22-b155-06c8437acfbf
Toumazou, Christofer
7a856162-f970-4ef4-8a57-5822d8a69281

Goh, Clinton Z.D., Georgiou, Pantelis, Constandinou, Timothy G., Prodromakis, Themistoklis and Toumazou, Christofer (2011) A cmos-based isfet chemical imager with auto-calibration capability. IEEE Sensors Journal, 11 (12), 3253-3260. (doi:10.1109/JSEN.2011.2155644).

Record type: Article

Abstract

This paper presents a novel auto-calibration technique for eliminating sensor mismatch in CMOS-based chemical imagers. Designed using an 8 × 8 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 0.35-?m CMOS technology and demonstrated a fast rate of convergence (500 ms per iteration) while a convergence accuracy of 45 mV on a gain of 10 (0.5% relative standard error and 2% pixel-to-pixel variation) was achieved. A maximum pH sensitivity of 57 mV/pH is also reported.

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More information

Published date: 2011
Organisations: Nanoelectronics and Nanotechnology

Identifiers

Local EPrints ID: 351539
URI: https://eprints.soton.ac.uk/id/eprint/351539
ISSN: 1530-437X
PURE UUID: 7e20c63a-2e01-4464-829d-84bc5bd4d1ec
ORCID for Themistoklis Prodromakis: ORCID iD orcid.org/0000-0002-6267-6909

Catalogue record

Date deposited: 23 Apr 2013 11:05
Last modified: 06 Jun 2018 12:24

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Contributors

Author: Clinton Z.D. Goh
Author: Pantelis Georgiou
Author: Timothy G. Constandinou
Author: Christofer Toumazou

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