| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 751559 | Sensors and Actuators B: Chemical | 2007 | 5 Pages |
Abstract
This paper presents the concept of a current mode readout circuit for the ion-sensitive field effect transistor (ISFET) to be used as a pH sensor. An ISFET in conjunction with a current mirror with global feedback to the source terminal yields linearity between a wide dynamic pH range and output. Operating the ISFET and current source in the weak inversion region reduces major problems arising from channel-length modulation. Our experiment using discrete components demonstrates very high accuracy readout with total power consumption including the ISFET of early microwatts.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Bhusana Premanode, Nawat Silawan, Wai Pan Chan, Chris Toumazou,