为满足医学上的需要,提出了开关电容电荷平衡A/ D 转换器,对其工作原理进行了详细地分析,并与压差式传感器、单片机构成了一个可远距离数据通讯的高准确度压差式传感器测量系统。 关键词:压差式传感器; 开关电容; 浮地; 电荷平衡 Abstract :For medicinal demand , the A/ D convertor based on charge balance on switch capacitor was put for2 ward. Its work theory was analysed in detail. A measure system of high precision pressure difference sensor is composed of pressure difference sensor and single chip microprocessor which can carry data far away. Key words :pressure difference sensor ; switch capacitor ; float off ground ; charge balance