Current-to-voltage-converter for a biosensor
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United States of America Patent
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Jun 21, 2005
Grant Date -
Sep 11, 2003
app pub date -
Mar 6, 2002
filing date -
Mar 6, 2002
priority date (Note) -
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Abstract
An integrated current-to-voltage conversion circuit converts a first current to an output voltage representative of the first current. The circuit includes a first contact pad and second and third contact pads capable of being coupled across a first resistor. A first operational amplifier has a first input coupled to the first contact pad for producing a first voltage thereat, a second input for receiving a reference voltage, and a first output coupled to the third contact pad. A second voltage appears at the third contact pad. A second operational amplifier has a second output at which a third voltage appears, a first input coupled to the second output, and a second input coupled to the second contact pad. The output voltage is substantially equal to the difference between the second and third voltages.
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