Pulse width modulation circuit for ISFET drift reset

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

We present the simulation results for a Pulse Width Modulation (PWM) circuit (to be fabricated in a 0.5 μm CMOS process) used to cycle the electric field in an Ion Sensitive Field Effect Transistor (ISFET). Vertical electric field, which controls the inversion layer in a field effect transistors, can be used to reset the inherent drift behavior of ISFET. A PWM circuit, to cycle the vertical field, enables us to precisely monitor the pH of an electrolyte without needing to manually calibrate the ISFET. Two or more ISFETs could be used with the devices alternatively being placed in reset and measurement mode. By combining the outputs from measurement phase of the devices, we can read the pH of the electrolyte continuously. The PWM circuit is composed of a 10.9 kHz ring oscillator, five divider circuits giving a 100,000 frequency division, a 6 bit counter, and a Digital to Analog Converter (DAC) that feeds into a comparator whose output selects the mode of operation for the ISFETs.

Original languageEnglish (US)
Title of host publicationIEEE SENSORS 2013 - Proceedings
DOIs
StatePublished - 2013
Event12th IEEE SENSORS 2013 Conference - Baltimore, MD, United States
Duration: Nov 4 2013Nov 6 2013

Other

Other12th IEEE SENSORS 2013 Conference
CountryUnited States
CityBaltimore, MD
Period11/4/1311/6/13

Fingerprint

Ion sensitive field effect transistors
Pulse width modulation
Networks (circuits)
Electrolytes
Electric fields
Inversion layers
Phase measurement
Digital to analog conversion
Field effect transistors

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Pulse width modulation circuit for ISFET drift reset. / Shah, Sahil; Blain Christen, Jennifer.

IEEE SENSORS 2013 - Proceedings. 2013. 6688269.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Shah, S & Blain Christen, J 2013, Pulse width modulation circuit for ISFET drift reset. in IEEE SENSORS 2013 - Proceedings., 6688269, 12th IEEE SENSORS 2013 Conference, Baltimore, MD, United States, 11/4/13. https://doi.org/10.1109/ICSENS.2013.6688269
Shah, Sahil ; Blain Christen, Jennifer. / Pulse width modulation circuit for ISFET drift reset. IEEE SENSORS 2013 - Proceedings. 2013.
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