High voltage generating circuit
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United States of America Patent
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Apr 8, 2003
Grant Date -
Nov 8, 2001
app pub date -
Apr 30, 2001
filing date -
May 2, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A voltage generating circuit in accordance with the present invention includes a plurality of pump stages for alternatingly performing its pumping and pre-charging operation, and a pre-charge stage for pre-charging a first pump stage to a first reference voltage level (e.g., a power supply level). Each of the pump stages can include first and second pumps with a symmetrical structure for alternatingly performing a pumping operation and a pre-charging operation during a first clock cycle, and a charge transfer switch. The charge transfer switch is connected between the pumping capacitors of the first and second pumps, for thereby sharing the charge of each pumping capacitor of the first and second pumps before the first clock cycle is finished.
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