An Auto-Calibrated Resistive Measurement System With Low Noise Instrumentation ASIC
An Auto-Calibrated Resistive Measurement System With Low Noise Instrumentation ASIC
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DOI：
10.1109/jssc.2020.3017639
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发表时间：
2020-11-01
影响因子：
5.4
通讯作者：
Baghini, Maryam Shojaei
中科院分区：
文献类型：
--
作者：
Ahmad, Meraj;Malik, Shahid;Baghini, Maryam Shojaei
大多数电阻传感器有一个大的基线电阻和一个相对较小的增量变化的电阻值由于测量。本文报道了一种基于半桥的多用途Delta R/R-s测量系统，适用于各种电阻式传感器。基于四相自动校准的微分和比率运算用于补偿传感器的基线电阻和由于非理想电路参数引起的不匹配。采用UMC 180nm工艺设计制造了一款低噪声电流发生器和低噪声、高CMRR电流模仪表放大器。开发并测试了Delta R/R-s测量系统的原型板。实验结果表明，该系统能够检测到更小的ppm水平，即约72 ppm的δ R/R-s，而基极电阻R-s值高达0.5 M ω，相对误差小于+/- 1%。实验还测试了寄生电容对传感器响应的影响。最后，用自制的位移传感器对系统进行了测试。
Most of the resistive sensors have a large baseline resistor and a relatively small incremental change in the resistor value due to the measurand. A half-bridge-based versatile Delta R/R-s measurement system for a wide range of resistive sensors is reported in this article. A four-phase auto-calibration-based differential and ratiometric operation is used to compensate for the baseline resistance of the sensor and the mismatches due to the non-ideal circuit parameters. A low-noise application-specific current generator and low noise, high CMRR current-mode instrumentation amplifier is designed and fabricated in UMC 180-nm technology. A prototype board of the Delta R/R-s measurement system is developed and tested. The experimental results show that the proposed system is able to detect even smaller ppm level of about 72 ppm of Delta R/R-s for the base resistor R-s value as high as 0.5 M Omega with a relative error of less than +/- 1%. The effect of the parasitic capacitors on the sensor response is also tested experimentally. Finally, the proposed system is tested with an in-house fabricated displacement sensor.