Apparatus for measuring electrical impedance
First Claim
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.
2 Assignments
0 Petitions
Accused Products
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.
-
Citations
8 Claims
-
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 Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
Specification
-
- Resources
-
Current AssigneeIn-Duk Hwang, Korea Advanced Institute of Science and Technology
-
Original AssigneeInformation and Communication University In-Duk Hwang, Research and Industrial Cooperation Group
-
InventorsHwang, In-Duk, Park, Sin-Chong
-
Primary Examiner(s)Deb, Anjan
-
Assistant Examiner(s)Kramskaya, Marina
-
Application NumberUS10/885,990Publication NumberTime in Patent Office888 DaysField of Search324/679, 324/76.79, 324/547, 324/123.C, 324/649, 324/629, 600/547US Class Current324/629CPC Class CodesG01R 27/02 Measuring real or complex r...
