| 摘要 |
A highly efficient charge pump circuit featuring easy circuit design and formation as well as high reliability includes transistors M1-M4 individually having a diode connection configuration and interconnected in cascade, and is adapted to alternately apply a clock signal and an inverted clock signal to the transistors via capacitor elements C1-C4. The charge pump employs a depression-type transistor as the transistors M1-M4 and has an arrangement wherein the transistors M1, M2 on an input side have a greater gate length than the succeeding transistors M3, M4 for increasing the efficiency of boosting voltage. The charge pump circuit includes a single type of device so as to facilitate the circuit design and formation and also to enhance the reliability thereof.
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