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http://repositorio.unicamp.br/jspui/handle/REPOSIP/345844
Type: | Artigo |
Title: | Ultra-low power integrated analog front-end for ISFET-based sensors |
Author: | Ponte, Ronaldo Martins da Barros, Angélica Denardi de Diniz, José Alexandre Sousa, Fernando Rangel de |
Abstract: | In this paper, an integrated analog front-end (AFE) to condition ISFET-based sensors is presented. This is accomplished by a pH-controlled ring oscillator (pHCO) that produces a pulse frequency-modulated signal proportional to pH of a testing solution. The AFE was designed in a 180-nm standard CMOS process and a Verilog-based model was used to aid electrochemical simulations. Sensorless measurements of the chip were carried out on the oscilloscope and results revealed a digitally-represented signal with 70 MHz/V of responsivity, under a sweeping voltage from 1.0 V to 1.2 V, and a worst-case scenario of 69.4 µW for the overall power consumption. Moreover, the circuit topology circumvents the body effect problems, suppress the use of OP-AMPs or ADCs, and allows monolithic integration |
Subject: | Detectores químicos |
Country: | Brasil |
Editor: | Sociedade Brasileira de Computação |
Rights: | Aberto |
Identifier DOI: | 10.29292/jics.v13i3.37 |
Address: | http://ojs.fei.edu.br/ojs/index.php/JICS/article/view/37 |
Date Issue: | 2018 |
Appears in Collections: | FEEC - Artigos e Outros Documentos |
Files in This Item:
File | Description | Size | Format | |
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2-s2.0-85065548891.pdf | 1.66 MB | Adobe PDF | View/Open |
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