Pumping circuit with amplitude limited to prevent an over pumping for semiconductor device
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United States of America Patent
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Jan 25, 2000
Grant Date -
N/A
app pub date -
Jul 31, 1998
filing date -
Feb 11, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
The pumping circuit for pumping the internal voltage supplied to a semiconductor device is disclosed, which is directed to comparing an internal voltage with previously set two reference voltages and differently varying a swing width of an output pulse from an oscillator in accordance with a result of the comparison. When there is a big difference between the internal voltage and a desired first reference voltage, the swing width of the output pulse from the oscillator is normally set, and when the internal voltage becomes the first reference voltage, the swing width of the ouput pulse from the oscillator is decreased, and when the swing width is decreased, the increasing width of the level of the internal voltage which is pumped and supplied to the semiconductor device is decreased, so that the over pumping of the internal voltage is prevented.
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