Title :
Readout circuit design for an EISCAP biosensor
Author :
Vemulachedu, Hareesh ; Pavan, Shanthi ; Bhattacharya, Enakshi
Author_Institution :
Indian Inst. of Technol. Madras, Chennai
Abstract :
We present the design of readout electronics for an Electrolyte Insulator Semiconductor capacitor (EISCAP) sensor. The sensor detects the presence of bioanalytes by sensing the change in the pH of the electrolyte. Our technique uses an EISCAP relaxation oscillator embedded in a successive approximation analog-to-digital conversion algorithm to give a digital readout of the pH of the test solution. A microcontroller based pH readout instrument, incorporating calibration to account for sensor variations, is described. Experimental results that demonstrate the efficacy of our techniques are given.
Keywords :
biosensors; chemical sensors; detector circuits; electrolytic capacitors; readout electronics; EISCAP biosensor; electrolyte insulator semiconductor capacitor; pH sensor; readout circuit design; readout electronics; Analog-digital conversion; Approximation algorithms; Biosensors; Capacitive sensors; Capacitors; Change detection algorithms; Circuit synthesis; Insulation; Oscillators; Readout electronics;
Conference_Titel :
Biomedical Circuits and Systems Conference, 2008. BioCAS 2008. IEEE
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-4244-2878-6
Electronic_ISBN :
978-1-4244-2879-3
DOI :
10.1109/BIOCAS.2008.4696877
