Post Go back to editing

AD5933 4-Electrode configuration for human body thoracic impedance measurement(0-60 ohm)

1.Please suggest the circuit diagram for 4-electrode configuration for human body thoracic impedance measurement range 0-60 ohm using ad5933

2.I want inject ac current 200uA at 100khz  ...please suggest the Resistor and capacitor value in the circuit diagram

3.Two electrodes for injecting the current and  another two electrodes for sensing the voltage 

4.I want operate the circuit at single power supply

5.I have referred the link: AD5933 4 Wire Configuration for low impedence (< 50 ohm) but there is no clarity in the diagram.Please suggest the circuit diagram for 4-electrode configuration for human body thoracic impedance measurement range

Parents
  • Hi,

    1- the AD5933 cannot measure DC (0ohms), anyway, the measurable range depends on the inamp gain.

    As suggesting a circuit,

    Many approaches... but I recommend this one. I used and works fine... I need to check the exact part numbers,

    2- at the output of the picture, transmitter have a cap and resistor,

    Cap whatever value, just block DC

    the resistor defines your current, your pk is Vpk/R

    NOTE- the feedback resistor in the opamp should be large >1Mohms

    If you are using your circuit in SS, you must add a RC in the inamp, to bias the signal.

    Regards,

    Miguel

Reply
  • Hi,

    1- the AD5933 cannot measure DC (0ohms), anyway, the measurable range depends on the inamp gain.

    As suggesting a circuit,

    Many approaches... but I recommend this one. I used and works fine... I need to check the exact part numbers,

    2- at the output of the picture, transmitter have a cap and resistor,

    Cap whatever value, just block DC

    the resistor defines your current, your pk is Vpk/R

    NOTE- the feedback resistor in the opamp should be large >1Mohms

    If you are using your circuit in SS, you must add a RC in the inamp, to bias the signal.

    Regards,

    Miguel

Children
No Data