| 摘要 |
A charge pump circuit includes a charge supplying capacitor, a constant voltage circuit such as a diode, and first and second switches serially arranged between a power supply terminal VDD and a ground terminal. When the first and second switches are turned ON, a voltage across the charge supplying capacitor is VDD- DELTA V, where DELTA V is a level shift amount produced by the constant voltage circuit. Also, the charge supplying capacitor is associated with third and fourth switches and they are serially arranged between the ground terminal and an output terminal. When the third and fourth switches are turned ON, the voltage across the charge supplying capacitor plus VDD, i.e., 2 VDD- DELTA V, is transferred to the output terminal.
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