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Impedance analyzer

  • US 9,050,017 B2
  • Filed: 07/23/2012
  • Issued: 06/09/2015
  • Est. Priority Date: 01/04/2012
  • Status: Active Grant
First Claim
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1. An impedance analyzer suitable to be coupled electrically across first and second body portions of a biological target for determining electrical impedance therebetween, comprising:

  • a readout module includinga control voltage generating unit operable to generate a control voltage that has a predetermined amplitude value, and includingan oscillator circuit operable for generating an oscillation signal, andan amplifying circuit that is connected electrically to said oscillator circuit for receiving the oscillation signal from said oscillator circuit, and that is operable to generate the control voltage based on the oscillation signal received by said amplifying circuit,a measuring unit adapted to be coupled electrically across the first and second body portions, connected electrically to said control voltage generating unit for receiving the control voltage from said control voltage generating unit, and operable to provide an output current according to the control voltage received by said measuring unit for flowing through the first and second body portions, the output current having an amplitude value that corresponds to the amplitude value of the control voltage received by said measuring unit, said measuring unit being further operable to generate a measurement voltage that has an amplitude value corresponding to a difference between voltages at the first and second body portions attributed to flow of the output current through the first and second body portions; and

    a calculating module having stored therein a predetermined adjustment value, connected electrically to said measuring unit for receiving the measurement voltage from said measuring unit, and operable to determine the electrical impedance between the first and second body portions according to the predetermined adjustment value and the amplitude value of the measurement voltage received by said calculating module;

    wherein said amplifying circuit includesfirst and second resistors, anda first operational amplifier having a first input terminal that is connected electrically to said oscillator circuit via said first resistor for receiving the oscillation signal from said oscillator circuit, a grounded second input terminal, and an output terminal that is connected electrically to said first input terminal of said first operational amplifier via said second resistor, said first operational amplifier being operable to generate the control voltage for output via said output terminal thereof.

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