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Use of AD5933 in LTspice for 4-wire Bioimpedance Measurement System

Category: Hardware
Product Number: AD5933

Hi, I'm new here and wanted to know how can I use the AD5933 chip in LTspice for my thesis work, I tried finding it in the LTspice library but I didn't get it. I want to include the AD5933 for the measurement of bioimpedance in the 4-wire system. Could someone please guide me on where can I include the AD5933 chip in my LTspice schematic for the 4-wire system? I'd be really grateful to you. Regards. 

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  • There is no official LTSpice model for AD5933 at the moment.

    You may use the attached files as a starting point. This model allows checking the compliance of the signal from an analog point of view, but it does not calculate impedance.

    Change the extension of .txt file to .plt before starting the simulation.

    EVAL-AD5933.asc

    [Transient Analysis]
    {
       Npanes: 3
       {
          traces: 1 {524291,0,"V(vadc)-V(Vbias)"}
          X: ('m',1,0,0.0001,0.00100068209699638)
          Y[0]: ('m',0,-0.006,0.001,0.005)
          Y[1]: ('_',0,1e+308,0,-1e+308)
          Volts: ('m',0,0,0,-0.006,0.001,0.005)
          Log: 0 0 0
          GridStyle: 1
       },
       {
          traces: 1 {524290,0,"V(vrx)-V(Vbias)"}
          X: ('m',1,0,0.0001,0.00100068209699638)
          Y[0]: ('m',1,-0.0012,0.0002,0.001)
          Y[1]: ('_',0,1e+308,0,-1e+308)
          Volts: ('m',0,0,1,-0.0012,0.0002,0.001)
          Log: 0 0 0
          GridStyle: 1
       },
       {
          traces: 1 {524292,0,"V(vtx)-V(Vbias)"}
          X: ('m',1,0,0.0001,0.00100068209699638)
          Y[0]: (' ',1,-1,0.2,1)
          Y[1]: ('_',0,1e+308,0,-1e+308)
          Volts: (' ',0,0,1,-1,0.2,1)
          Log: 0 0 0
          GridStyle: 1
       }
    }
    

Reply
  • There is no official LTSpice model for AD5933 at the moment.

    You may use the attached files as a starting point. This model allows checking the compliance of the signal from an analog point of view, but it does not calculate impedance.

    Change the extension of .txt file to .plt before starting the simulation.

    EVAL-AD5933.asc

    [Transient Analysis]
    {
       Npanes: 3
       {
          traces: 1 {524291,0,"V(vadc)-V(Vbias)"}
          X: ('m',1,0,0.0001,0.00100068209699638)
          Y[0]: ('m',0,-0.006,0.001,0.005)
          Y[1]: ('_',0,1e+308,0,-1e+308)
          Volts: ('m',0,0,0,-0.006,0.001,0.005)
          Log: 0 0 0
          GridStyle: 1
       },
       {
          traces: 1 {524290,0,"V(vrx)-V(Vbias)"}
          X: ('m',1,0,0.0001,0.00100068209699638)
          Y[0]: ('m',1,-0.0012,0.0002,0.001)
          Y[1]: ('_',0,1e+308,0,-1e+308)
          Volts: ('m',0,0,1,-0.0012,0.0002,0.001)
          Log: 0 0 0
          GridStyle: 1
       },
       {
          traces: 1 {524292,0,"V(vtx)-V(Vbias)"}
          X: ('m',1,0,0.0001,0.00100068209699638)
          Y[0]: (' ',1,-1,0.2,1)
          Y[1]: ('_',0,1e+308,0,-1e+308)
          Volts: (' ',0,0,1,-1,0.2,1)
          Log: 0 0 0
          GridStyle: 1
       }
    }
    

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