Self-powering input buffer
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United States of America Patent
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-
Jul 18, 2006
Grant Date -
Dec 15, 2005
app pub date -
May 28, 2004
filing date -
May 28, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A self-powering input buffer includes a first circuit leg that stores a charge, such as in a capacitor and a second circuit leg with a buffer powered by the first circuit leg that detects a state of an input with reference to a threshold. A transistor switch is coupled between the circuit legs. If the buffer detects an input voltage higher than the predetermined threshold the buffer drives the transistor switch ON to conduct current from the first circuit leg to the output. If the buffer detects an input voltage lower than the predetermined threshold the buffer drives the transistor switch OFF to disconnect the first circuit leg from the output. During a voltage dip the capacitor provides supplemental power as long as the input is above the threshold.
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