Apparatus for measuring electrical impedance
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United States of America Patent
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Dec 12, 2006
Grant Date -
Jul 14, 2005
app pub date -
Jul 7, 2004
filing date -
Jan 8, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides an apparatus for measuring electrical impedance comprising: two input electrodes contacted to a subject for measuring impedance; a difference amplifier to which two signals inputted to the two input electrodes are inputted; a device for extracting a common mode component of two signals inputted to the two input electrodes; the third electrode contacted to the subject for measuring impedance; the first multiplier to which the common mode component is inputted; the first filter coupled with the first multiplier; the second multiplier coupled with the first filter; wherein a feedback signal outputted from the second multiplier is inputted to the third electrode.
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