| 摘要 |
A dual voltage charge pump circuit to be associated with one power supply (11 ) for the purpose of generating to positive and negative output voltages (Vpos, Vneg), with two different low and high levels. The circuit comprises two flying capacitors (32, 33) and two tank capacitors (31, 34). PMOS transistors PO, P1 and P2 and NMOS transistor N1, N3 and N4 for achieving the charge transfer between the fly capacitor and the respective tank capacitor. Additional transistors P3 and N5 are used for providing a low voltage charge pump as well as charge compensation between the two fly capacitors. Preferrably, one fly capacitor has one end directly connected to the ground, what reduces the complexity of the dual charge pump and achieves saving of MOS transistor and ball. |
