| 摘要 |
A charge pump circuit with improved pump efficiency and usable in a semiconductor memory device, includes a charge node, a pump capacitor for pumping charges of the charge node, a charge transfer transistor connected between the charge node and an output node so as to transfer the charges of the pumped charge node, a charging transistor for charging the charge node with a predetermined voltage, and a first transistor coupled to the charge node for preventing flow-back of charges from an output node to the charge node during a charging interval.
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