论文部分内容阅读
电容式传感器可以将非电量变化转换为电容量变化,具有较高的灵敏度、相对较低功耗等特点,已被广泛应用在压力、湿度、温度和加速度等测量中。本研究分析的微电容式传感器是将敏感电容、接口电路集成于一块芯片上。这种传感器需要匹配的接口集成电路才能满足精度的需求。分析该微电容式传感器接口电路问题并测试样片,结果显示输出频率与理论值存在较大的偏差。通过对原因的寻找,得出几点解决方案,包括设定启动电路、改善开关控制电路等。
Capacitive sensors can convert non-power changes to changes in capacitance with high sensitivity, relatively low power consumption and other characteristics, has been widely used in pressure, humidity, temperature and acceleration measurements. This study analyzed the micro-capacitance sensor is sensitive capacitance, interface circuit integrated in a chip. This sensor requires a matching interface IC to meet the accuracy requirements. Analysis of the micro-capacitance sensor interface circuit problems and test samples, the results show that there is a large deviation between the output frequency and the theoretical value. Through the search for the reasons, come to several solutions, including setting start-up circuit, improve the switch control circuit.