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定义:
电容=电荷量/电压值
Cxy = dQx/dVy
所以:
Cgg = dQg/dVg : the total capacitance of a mos seen from the gate:栅对地的总电容
Cgs = dQg/dVs : the capacitance between gate and source:栅源电容
Cgd = dQg/dVd : the capacitance between gate and drain:栅漏电容
Cgb = dQg/dVb : the capacitance between gate and body(Substrate):栅-衬底电容