Input buffer circuit and semiconductor memory device
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United States of America Patent
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May 24, 2005
Grant Date -
Sep 11, 2003
app pub date -
Mar 4, 2003
filing date -
Mar 6, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
An input buffer circuit is made up from: a differential amplifier that receives an input signal from the outside and a reference voltage for determining the level of the input signal; a transistor for a first operating current path for supplying a prescribed first operating current to the differential amplifier and that, by having a prescribed fixed voltage supplied to its gate, is always ON; and at least one transistor for a second operating current path for supplying a second operating current that is greater than the first operating current to the differential amplifier when ON, the transistor for the second operating current path being ON/OFF controlled in accordance with a control signal from the outside.
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