Accurate and efficient sensing method for bi-directional signals
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United States of America Patent
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Jul 4, 2006
Grant Date -
May 11, 2006
app pub date -
Dec 12, 2005
filing date -
Jan 14, 2004
priority date (Note) -
Expired
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Abstract
An exemplary method and circuit for sensing bi-directional current through a resistive element comprises a sampling unit, a charge transfer unit, and an amplifier. The sampling unit is switchably coupled to the resistive element and samples and stores a voltage corresponding to a current flowing through the resistive element. The charge transfer unit switchably connects the sampling unit to the amplifier such that the charge transfer unit and the amplifier convert the sampled voltage to a ground-referenced output voltage corresponding to the magnitude of the current and in accordance with the direction of the current through resistive element.
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