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首页> 外文会议>IEEE International Conference on Control, Measurement and Instrumentation >Switched Capacitor Single-Slope Capacitance to Direct Digital Converter for Differential Capacitive Sensors
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Switched Capacitor Single-Slope Capacitance to Direct Digital Converter for Differential Capacitive Sensors

机译：切换电容器单斜率电容，直接数字转换器进行差电容传感器

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摘要

A novel, simple and accurate Single-Slope Capacitance-to-Digital Converter (SSCDC) suitable for differential capacitive sensors is presented in this paper. Differential capacitive sensors have two capacitors that vary in a push-pull manner with-respect-to the measurand. In many such sensors, the relationship between capacitance and measurand is non-linear. The proposed SSCDC accepts the sensor capacitances having non-linear characteristics, and provides a linear digital output directly proportional to the measurand (without employing a dedicated ADC) for the full range of input. It also provides a faster conversion rate when compared to its Dual-Slope CDC counterpart. Simulation studies and experimental results obtained from a prototype built and tested prove the efficacy of the proposed scheme. The worst case non-linearity was within 0.3%.
机译：本文提出了一种适用于差动电容传感器的新颖，简单且精确的单斜率对数字转换器（SSCDC）。差动电容传感器具有两个以推挽方式改变的电容器，相对于测量。在许多这样的传感器中，电容和测量之间的关系是非线性的。所提出的SSCDC接受具有非线性特性的传感器电容，并提供直接与测量的线性数字输出（不使用专用ADC）进行全方位输入。与其双斜率CDC对应物相比，它还提供更快的转换率。从原型建造和测试获得的模拟研究和实验结果证明了所提出的方案的功效。最坏的情况下的非线性在0.3％范围内。

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