Low voltage level shifter for low power applications
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United States of America Patent
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Aug 18, 2015
Grant Date -
Sep 11, 2014
app pub date -
Mar 6, 2013
filing date -
Mar 6, 2013
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Abstract
A level shifter circuit for low power applications that can shift the level of a digital signal that is below the threshold voltage of output transistors. The level shifter uses core transistors in the input stage and includes an intermediate stage that limits the voltage applied to the drain of the core transistors. The intermediate stage may include two transistors whose gate is connected to a reference voltage and turns off when the voltage at their source is equal to a threshold voltage below the reference voltage, thus limiting the maximum voltage applied to the transistors present in the input stage.
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