| 摘要 |
In a conventional voltage conversion circuit, a switching control unit for controlling a pumping operation to be alternately performed is decided by a delay of an inverter, and thus a switching timing is inefficiently considerably varied according to the delay. Also, a well bias is applied to prevent a switch from being latched up. However, a large layout area is required in order to generate the well bias. A voltage conversion circuit according to the present invention can reduce a layout area and power consumption and improve conductivity and reliability, by efficiently driving a pumping capacitor by receiving an oscillation signal during a voltage pumping operation and using transitions from high to low and from low to high without overlapping each driving signal through a flip-flop switching structure, and by solving reduction of a threshold voltage of an NMOS transistor by controlling a precharge and switching transistor with a PMOS transistor.
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