Semiconductor integrated circuit including voltage converter effective at low operational voltages
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United States of America Patent
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-
Jun 8, 1999
Grant Date -
N/A
app pub date -
Aug 26, 1997
filing date -
Aug 27, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A push-pull type output circuit is used in the differential amplifier of a voltage converter circuit. The threshold voltage of the driving transistor is set lower than the voltages of the transistors of the other circuits to operate the differential amplifier at a voltage higher than the power supply voltage. By using the push-pull type output circuit, the amplitude increases and it is possible to raise the capacity of the driving transistor. Moreover, by setting the threshold voltage of the driving transistor of the buffering circuit lower than the threshold voltages of the transistors of the other circuits, it is possible to further raise the driving capacity. Increase of the sub-threshold current due to lowering of the threshold voltage can be prevented by operating the differential amplifier at a voltage higher than the power supply voltage.
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