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。
For capacitive sensing, driving signal with DC bias voltage and ac voltage is usually necessary for the measurement of capacitance.
全数字PWM 交流主轴驱动系统的关键在于如何实时地得到PWM 开关信号。
The key of the fully digital PWM speed regulation system is how to get the PWM signals on-line.
同时，建立微陀螺驱动模态等效电学模型，并对它进行交流小信号分析；
The equivalent electricity model of micro-gyroscope's driving mode is established and analyzed as AC characteristics using Hspice.
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