在传统的CMOS电荷泵电路中，电荷泵输出的电压受MOS管的阈值电压限制，所以当要求电荷泵的输出电压较高时，则不得不连很多阶来达到要求。

In conventional CMOS charge pump circuits, the pumping high voltage is limited by MOS threshold voltage, so that it can not use less cascade stages to pull up a high voltage which we want to generate.

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