Charge pump circuit
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United States of America Patent
Stats
-
Dec 30, 2003
Grant Date -
Mar 27, 2003
app pub date -
Sep 4, 2002
filing date -
Sep 21, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A highly efficient charge pump circuit featuring easy circuit design and formation as well as high reliability includes transistors M.sub.1 -M.sub.4 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 C.sub.1 -C.sub.4. The charge pump employs a depression-type transistor as the transistors M.sub.1 -M.sub.4 and has an arrangement wherein the transistors M.sub.1, M.sub.2 on an input side have a greater gate length than the succeeding transistors M.sub.3, M.sub.4 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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