Slew rate controlled level shifter with reduced quiescent current
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United States of America Patent
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Mar 16, 2010
Grant Date -
Mar 4, 2010
app pub date -
Aug 28, 2008
filing date -
Aug 28, 2008
priority date (Note) -
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Abstract
A level shifter circuit includes two parallel current paths respectively controlled by switch transistors, a Wilson current mirror circuit, and a slew rate control circuit to selectively couple an output node either to a high (first) voltage source or to a ground (second voltage) source in response to differential input control signals signal. When the output node reaches a stable (high or low) voltage level, the low voltage on one of the current paths turns off a Wilson current mirror transistor in the other current path, thereby preventing quiescent current during stable periods. An optional cascode transistor is added to facilitate fabrication using low threshold voltage transistors.
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