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Proceedings Paper

High resolution CMOS capacitance-frequency converter for biosensor applications
Author(s): I. S. Ghoor; K. Land; T-H. Joubert
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Paper Abstract

This paper presents the design of a low-complexity, linear and sub-pF CMOS capacitance-frequency converter for reading out a capacitive bacterial bio/sensors with the endeavour of creating a universal bio/sensor readout module. Therefore the priority design objectives are a high resolution as well as an extensive dynamic range. The circuit is based on a method which outputs a digital frequency signal directly from a differential capacitance by the accumulation of charges produced by repetitive charge integration and charge preservation1. A prototype has been designed for manufacture in the 0.35 μm, 3.3V ams CMOS technology.

At a 1MHz clock speed, the most pertinent results obtained for the designed converter are: (i) power consumption of 1.37mW; (ii) a resolution of at least 5 fF for sensitive capacitive transduction; and (iii) an input dynamic range of at least 43.5 dB from a measurable capacitance value range of 5 – 750 fF (iv) and a Pearson’s coefficient of linearity of 0.99.

Paper Details

Date Published: 3 February 2017
PDF: 6 pages
Proc. SPIE 10036, Fourth Conference on Sensors, MEMS, and Electro-Optic Systems, 100360F (3 February 2017); doi: 10.1117/12.2244148
Show Author Affiliations
I. S. Ghoor, Univ. of Pretoria (South Africa)
K. Land, Council for Scientific and Industrial Research (South Africa)
T-H. Joubert, Univ. of Pretoria (South Africa)


Published in SPIE Proceedings Vol. 10036:
Fourth Conference on Sensors, MEMS, and Electro-Optic Systems
Monuko du Plessis, Editor(s)

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