Current measurement circuit
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United States of America Patent
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Sep 9, 2003
Grant Date -
N/A
app pub date -
Sep 11, 2001
filing date -
Sep 11, 2001
priority date (Note) -
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Abstract
The present invention is connected across a sense resistor which carries a current of interest. A first pair of cross-coupled switches are connected between the sense resistor and respective input capacitors, and a second pair of cross-coupled switches are connected between the input capacitors and the inputs of an amplifier having differential inputs and outputs. Feedback capacitors are connected between each of the amplifier's outputs and inputs. A control circuit operates the cross-coupled switches in accordance with a switching cycle, during which the connections between the sense resistor and the input capacitors are interchanged, after which the connections between the input capacitors and the differential amplifier are interchanged. When so arranged, the sensed voltage is sampled on the input capacitors and transferred to the feedback capacitors to produce a differential output voltage V.sub.out from the differential amplifier which is proportional to the current of interest.
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