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A modified Direct Digital Converter for resistive sensors in bridge form
, V. Jagadeesh Kumar
Published in Institute of Electrical and Electronics Engineers Inc.
2015
Abstract
Direct Digital Converter (DDC) suitable for resistive sensor elements connected in the form of bridge provides a digital output proportional to quantity being sensed. However, such a DDC requires that all the four sensor elements are to be identical. If there is a mismatch between the sensor elements (nominal values of the four resistances not equal) the error in the output of the DDC increases drastically. We now present a modified DDC that can tolerate mismatch between the four sensing elements of a bridge type resistive sensor. While the worst case error observed from the conventional DDC scheme rises from ± 0.07% to ± 1.32 % (simulation studies) for a very low mismatch of 0.03 %, the worst case error observed from the improved DDC scheme proposed here is only ± 0.24%. © 2014 IEEE.
Concepts (11)
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    Errors
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    Strain gages
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    DIGITAL CONVERTERS
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    NOMINAL VALUES
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    RESISTIVE SENSOR
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    Sensing elements
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    SENSOR ELEMENTS
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    Simulation studies
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    WHEATSTONE BRIDGES
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    WORST CASE ERROR
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    Frequency converters