【摘要】 桥式压力/差压传感器的信号调理和补偿算法是国内外智能仪表的研究重点,合理的信号调理电路或器件,以及正确的补偿算法,将极大地提高仪表性能。PGA309作为数字化可编程信号调理芯片,主要用于电阻桥式压力传感器,将微弱的传感器桥路信号进行放大输出。通过介绍PGA309调理芯片的内部功能结构,利用数学模型重点分析了PGA309对传感器固有特性(非线性、温度漂移)进行补偿的原理,并用实际的传感器测量数据进行了验证。根据PGA309的特点,结合单片机系统,提出了对补偿进行改进的方案。更多还原

【Abstract】 Signal conditioning and compensation algorithm of bridge type pressure / differential pressure sensors are the key points of researching intelligent instruments world-wide.Performance of instruments can be improved by reasonable signal conditioning or component and correct compensation algorithm.As a digital programmable chip of signal conditioning chip,PGA309 is mainly used in resistance bridge pressure sensors,it amplifies and outputs the weak signal from the sensor.The internal functional structure of the chip is introduced,and the principle of compensating the inherent characteristics(non-linearity,temperature drift) of the sensor is analyzing by mathematical model.The results are verified with practical measurement data of the sensors.Finally,the improving strategy of compensation is proposed based on the features of analyzing PGA309,and combining with the single chip computer.更多还原