期刊
IEEE SENSORS JOURNAL
卷 20, 期 23, 页码 13910-13918出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2020.2971315
关键词
Direct interface circuits; calibration methods; error analysis; quantization error; resistive sensor; interface sensor; time-based measurement
资金
- Spanish Government
- European ERDF Program Funds [TEC2015-67642-R]
- Universidad de Malaga under Program Plan Propio 2018
Reading resistive sensors and converting their information to digital values is a matter of great interest in practical applications. Direct Interface Circuits (DICs) perform this task efficiently through a resistance-to-time-to-digital conversion. The main benefit of this type of circuit is the simplicity of its design and the accuracy of the results. However, one of its drawbacks is that quantization errors in the measurements seriously compromise accuracy if the information is not converted using a high-frequency clock or with high capacitor values. To avoid this situation, this article presents a new type of DIC with the same passive elements as a classic DIC, but which uses a high value resistor in the final instant of the resistance-to-time conversion. The circuit has been implemented using a commercial FPGA with the capture module operating at different clock frequencies. The results show that relative errors in measuring resistors of up to 33 Omega decrease to 1.56% when operating with a 12.5 MHz timer.
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