Charge pump circuit

A charge pump circuit having a charge pump unit structure comprising:

• a booster circuit unit;
• a positive pump transfer unit;
• and
• a negative pump transfer unit;
• wherein an output terminal of the booster circuit unit is connected to an input terminal of the positive pump transfer unit through a first switch circuit;
• wherein the output terminal of the booster circuit unit is connected to an input terminal of the negative pump transfer unit through a second switch circuit;
• wherein a control end of the positive pump transfer unit is connected to an erase enable signal and a first enable signal;
• and a control end of the negative pump transfer unit is connected to the erase enable signal and a second enable signal, and the second enable signal is an inverted signal of the first enable signal;
• wherein a control terminal of the first switch circuit is connected to the first enable signal, and a control terminal of the second switch circuit is connected to the second enable signal;
• wherein when the erase enable signal is enabled, the charge pump circuit outputs both a positive voltage signal and a negative voltage signal;
• wherein during an enabling process of the erase enable signal, when the first enable signal is enabled, the first switch circuit is conducted, the second switch circuit is switched off, the positive pump transfer unit works, the negative pump transfer unit stops working, the booster circuit unit provides a boost signal to the positive pump transfer unit and a positive voltage charge pump unit is composed of the booster circuit unit and the positive pump transfer unit, and the positive voltage charge pump unit works and outputs a unit positive voltage signal from an output terminal of the positive pump transfer unit;
• wherein during the enabling process of the erase enable signal, when the second enable signal is enabled, the second switch circuit is conducted, the first switch circuit is switched off, the negative pump transfer unit works, the positive pump transfer unit stops working, the booster circuit unit provides a boost signal to the negative pump transfer unit, and a negative voltage charge pump unit is composed of the booster circuit unit and the negative pump transfer unit, and the negative voltage charge pump unit works and outputs a unit negative voltage signal from an output terminal of the negative pump transfer unit.