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Spice- Frequency Dependent Resistance in transient.

Discussion in 'General Electronics Discussion' started by kilio, Oct 12, 2010.

  1. kilio

    kilio

    3
    0
    Oct 12, 2010
    I would like to know if there is any way to make a frequency dependant resistor for transient simulation in OrCad ( PSpice). I have some empirical data and I would like to use it .
    Any help would be greatly appreciated.
     
  2. NickS

    NickS

    367
    0
    Apr 6, 2010
    Sort of. Frequency is a bit tricky because it is usually correlated with impedance which has a resistance and reactance component. The reactance changes with frequency but resistance does not. So to to simulate a change in resistance with frequency I am not sure on that but to change the impedance with frequency could be a simple as operating in the skirt(transition band) of a low pass single pole filter. The slope would be roughly 20dB/decade for voltage. The attenuation would increase with frequency but there would not be a DC resistance change. Is that something that could be molded into a solution or does it have to be resistance change alone?

    Perhaps you could give a bit more info on what the changing resistance needs to do.
     
  3. kilio

    kilio

    3
    0
    Oct 12, 2010
    "
    Resistance changes with frequency in AC -- ex. skin effect.
     
  4. NickS

    NickS

    367
    0
    Apr 6, 2010
    But again this measurement is only possible at AC. So I ask again how do you plan on using it? If you are in the realm of simulating surface resistance then you are going to need a more powerful simulation tool like ADS or Microwave Office.
     
  5. Militoy

    Militoy

    180
    0
    Aug 24, 2010
    Also - unless the conductor is straight - like an uncoupled trace on a PCB - proximity effect is likely to be as much or more of an issue than skin effect.
     
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