×

Apparatus for measuring electrical impedance

  • US 7,148,701 B2
  • Filed: 07/07/2004
  • Issued: 12/12/2006
  • Est. Priority Date: 01/08/2004
  • Status: Expired due to Fees
First Claim
Patent Images

1. 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 the 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; and

    the second multiplier coupled with the first filter such that the first and second multipliers and the first filter are in series;

    wherein a feedback signal outputted from the second multiplier is inputted to the third electrode.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×