| 摘要 |
<p>PURPOSE: To achieve an efficiency of about 40% by generating 2VCC-Vt N (VCC is power supply voltage, Vt N is threshold voltage) at a node using a subcharge pump circuit and pumping a capacitive load using a main charge pump circuit. CONSTITUTION: The inventive charge pump comprises a subpump including elements shown in block 10, and a main pump including elements not shown in block 10 and connected to receive six types of clock signal CP1-CP6. Nodes 13, 24, 26, 36, 40, 48 and 58 follow clock pulses CP1, CP2, CP3, CP5, CP4, CP6 and CP1, respectively, and operate between VCC and 2VCC. As a result, the main charge pump can pump up to the theoretical maximum level of the VCC while keeping an efficiency of 40% through the subcharge pump.</p> |
