For capacitive sensing, driving signal with DC bias voltage and ac voltage is usually necessary for the measurement of capacitance.
对电容式加速度计，为测量其电容的变化，通常需要带直流偏置的交流电压信号来驱动。
The novel design solved the problem of limited voltage swing range caused by bias voltage at input of the OPA and achieved higher bandwidth compared to ac coupled design method.
使用文中介绍的方法设计单电源运算放大器能巧妙地解决由偏置电压引起的信号摆幅受限的问题，有较高的动态范围，而且具有比交流耦合更高的带宽。
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