石英加速度计的高分辨率大量程I/F转换电路

High Resolution Large Range I/F Conversion Circuit of Quartz Accelerometer

针对石英挠性加速度计I/F转换电路存在高分辨率和大量程相互矛盾的问题,对影响I/F转换电路的分辨率和量程的主要原因进行了分析,提出了一种新型I/F转换电路的设计方法。该方法在电路结构上,额外增加2路比较器,对小电流信号的极性进行判断,通过设置时间内的积分电压是否达到门限电压来区分大、小电流,并对大、小电流分别执行不同的解算程序。结果表明:该方法解决了原有I/F转换电路存在的高分辨率和大量程相互矛盾的问题,提升了石英挠性加速度计I/F转换电路在小电流下的分辨率。

For the contradiction between high resolution and large range in the I/F conversion circuit of quartz flexible accelerometer,the main reasons affecting the resolution and range of I/F conversion circuit were analyzed,and a new design method of I/F conversion circuit was proposed.In the circuit structure,two additional comparators were added to judge the polarity of the small current signal.The large and small currents were distinguished by setting whether the integral voltage within the time reaches the threshold voltage or not,and executed different calculation programs respectively.The results show that this method solves the contradiction between high resolution and large range in the original I/F conversion circuit,and improves the resolution of the conversion circuit of quartz flexible accelerometer under low current.