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RTD传感器的标准使用方式是把它包含在后接一个差分放大器的桥路中。问题在于,两个非线性因素(一个来自传感器,一个来自桥路)会影响传递函数。一些方法试图避免这个问题,但它们往往既庞大又昂贵(参考文献1、参考文献2、参考文献3)。某种备选电路建议只给差分放大器添加一个额外电阻,但它既未提供设计指导原则,也未提供结果(参考文献4)。本设计实例填补了这个空白。虽然电路分析有些复杂,但性能很好,并且该电路使用的元件很少。
The standard use of RTD sensors is to include it in the bridge followed by a differential amplifier. The problem is that two non-linear factors (one from the sensor and one from the bridge) affect the transfer function. Some approaches try to avoid this problem, but they tend to be bulky and expensive (Reference 1, Reference 2, Reference 3). Some alternative circuits suggest adding only an extra resistor to the differential amplifier, but neither provides design guidelines nor results (Reference 4). This design example fills this gap. Although circuit analysis is somewhat complicated, it performs well and uses very few components.