Digital Converter for Differential Capacitive Sensors

A digital converter that directly translates variations in the capacitances of a differential-type capacitive sensor to a proportional digital value is described in this paper. A conventional dual-slope, analog-to-digital converter is suitably modified to obtain direct capacitance-to-digital convers...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2008-11, Vol.57 (11), p.2576-2581
Main Authors: Madhu Mohan, N., Shet, A.R., Kedarnath, S., Jagadeesh Kumar, V.
Format: Article
Language:English
Subjects:
Analog-digital conversion
Capacitance
Capacitance-to-digital converter
Capacitive sensors
Capacitors
Circuits
Conversion
Converters
differential capacitive sensor
Digital
digital converter
Digital systems
dual-slope technique
Effectiveness
Frequency conversion
Gain
Instrumentation
Instruments
sensor signal conditioning
Sensors
Switches
Transducers
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Description
Summary:A digital converter that directly translates variations in the capacitances of a differential-type capacitive sensor to a proportional digital value is described in this paper. A conventional dual-slope, analog-to-digital converter is suitably modified to obtain direct capacitance-to-digital conversion (CDC). Analysis of the proposed technique indicates that the effects of nonidealities and variations in circuit parameters on the performance of the CDC is either in the form of a gain error and/or an offset, both of which can be easily compensated. Simulation studies and experimental results obtained from a prototype built and tested prove the efficacy of the proposed scheme.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2008.922109