Voltage level shifting circuit
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United States of America Patent
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Sep 1, 2015
Grant Date -
Mar 19, 2015
app pub date -
Sep 17, 2013
filing date -
Apr 20, 2011
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Abstract
A level shifter shifts the level of an input signal from a second voltage domain to a first voltage domain. To accommodate different input signal levels (e.g., including sub-threshold input signal levels) that may arise due to changes in the supply voltage for the second voltage domain, current for a latch circuit of the level shifter is limited based on the supply voltage for the second voltage domain. In this way, a drive circuit of the level shifter that controls the latch circuit based on the input signal is able to initiate a change of state of the latch circuit over a wide range of input signal levels.
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