APPARATUS AND METHOD FOR TRACKING AND CANCELLING DC OFFSET TO ACQUIRE SMALL AC SIGNAL
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United States of America Patent
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Dec 29, 2016
app pub date -
Jun 27, 2015
filing date -
Jun 27, 2015
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Abstract
Described is an apparatus which comprises: a source to generate a first current having AC and DC components; a current-to-voltage converter to convert the first current or a copy of the first current to a first voltage proportional to a resistance, the first voltage having AC and DC components that correspond to the AC and DC components of the first current; a sample-and-hold circuit to filter the AC component from the first voltage and for providing an output voltage with the DC component; and an amplifier to receive the output voltage.
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