Charge pumping circuit used for a positive and negative charge pump formed in a single circuit

摘要

The present invention is to provide to a charge pumping circuit capable of reducing the area of the layout by making the positive and negative charge pump in a single circuit, of enhancing the efficiency of the pump and of making the pumping speed high with the high driving voltage. The charge pumping circuit comprises: a charge pump for generating voltage amplitude which is over Vdd; a positive charge pump for transferring positive charges from the charge pump in response to a first control signal; a negative charge pump for transferring negative charges from the charge pump in response to the first control signal; and a controller for making a voltage, which is applied to the negative charge pump, to a ground voltage level at a negative charge operation, and for providing a voltage level for the negative charge pump to prevent charges from flowing to the negative charge pump.