Journal ArticleDOI
An Improved Direct Digital Converter for Bridge-Connected Resistive Sensors
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TLDR
In this article, an improved direct digital converter (IDDC) suitable for bridge-connected resistive sensors is presented, where the input stage of a dual-slope analog-to-digital converter is altered to accommodate a resistive sensor bridge, as its integral part and the logic of conversion incorporate automatic compensation for offset, offset drift and gain errors.Abstract:
An improved direct digital converter (IDDC) suitable for bridge-connected resistive sensors is presented in this paper. The input stage of a dual-slope analog-to-digital converter is altered to accommodate a resistive sensor bridge, as its integral part and the logic of conversion incorporate automatic compensation for offset, offset drift, and gain errors. Through a detailed error analysis of the DDC presented earlier, the effects of the non-ideal characteristics of practical components on the performance of the DDC are quantified. From the analysis, it is determined that mismatch between the bridge elements and the input offset of op-amps significantly affect the output. While the earlier version of the DDC requires offline correction for offset and gain errors, the proposed IDDC provides in situ correction for these and hence can also compensate drifts. Simulation studies and experimental results demonstrate the practicality of the proffered scheme and indicate that the worst case error of ±0.2% due to offset in op-amps and mismatch in nominal resistances of sensing elements reduces to ±0.05% with the use of the proposed compensation technique.read more
Citations
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Journal ArticleDOI
A Linearizing Digitizer for Wheatstone Bridge Based Signal Conditioning of Resistive Sensors
TL;DR: A novel signal conditioning scheme, which provides a linear-digital output directly from the resistive sensor(s) that are connected in such bridge configurations, and drastically reduces the effect on the output due to the lead wires that connect the Wheatstone bridge and the DSADC.
Journal ArticleDOI
A Resistive Sensor Readout Circuit With Intrinsic Insensitivity to Circuit Parameters and Its Evaluation
TL;DR: A novel readout circuit for interfacing single element resistive sensors is presented, based on a new relaxation oscillator (RO), which provides a digital output proportional to the resistance of the sensor.
Journal ArticleDOI
A 16.1-bit Resolution 0.064-mm 2 Compact Highly Digital Closed-Loop Single-VCO-Based 1-1 Sturdy-MASH Resistance-to-Digital Converter With High Robustness in 180-nm CMOS
TL;DR: A novel direct resistive-sensor-to-digital readout circuit is presented, which achieves 16.1-bit ENOB while being very compact and robust, and high electromagnetic interference (EMI) immunity at the sensor node is demonstrated.
Journal ArticleDOI
Performance Verification of a Digital Interface Suitable for a Broad Class of Resistive Sensors
TL;DR: An improved digital interface circuit for resistive sensors that offers use of single-reference voltage in its architecture, facility to tune/preset the sensor-excitation current, and minimal dependence on many circuit non-ideal parameters is proposed.
Journal ArticleDOI
A Dual Slope LVDT-to-Digital Converter
TL;DR: In this paper, a simple LVDT-to-digital converter that does not require a precise sine-wave excitation or a phase-matching circuit is presented.
References
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Proceedings ArticleDOI
Direct digital converter for a single active element resistive sensor
TL;DR: A direct digital converter that provides a digital output, proportional to the measurand being sensed by a single active element resistive sensor is presented and a high level of linearity and accuracy is achieved.
Proceedings ArticleDOI
A direct-digital converter for resistive sensor elements in bridge configuration
TL;DR: A dual slope direct digital converter suitable for resistive sensor elements already connected in the form of a Wheatstone bridge, and simulation studies establish the efficacy and practicability of the proposed DDC.