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Frequency dependent resistor in PSpice

Discussion in 'General Electronics Discussion' started by Bala_01, May 31, 2016.

  1. Bala_01

    Bala_01

    6
    0
    May 30, 2016
    Think a simple case. I want to create frequency dependent resistor R1. The value of R1 is as follows:
    at 1 MHz -> R1 = 2
    at 5 MHz -> R1 = 10
    at 10 MHz -> R1 = 20
    at 100 MHz -> R1 = 200
    Thant means R1 is a function of frequency where R1=2* Frequency. Consider only the numerical value of frequency not unit. How can I implement in Pspice ?

    Best regards,
    Bala
     
  2. davenn

    davenn Moderator

    13,294
    1,758
    Sep 5, 2009
    pretty sure there's no such thing as a frequency dependent resistor
    in my 40+ yrs of electronics have never heard of one


    so what are really trying to achieve ??
     
  3. Bala_01

    Bala_01

    6
    0
    May 30, 2016
    Hi,
    I have found the solution. It can be done with Laplace transformation.
    ************ Test ***************
    .subckt Test01
    + 1 2
    *
    *
    G_Rvar1 1 2 LAPLACE { V(1)} {1 /((1/K1)*(s/(2*PI)))}
    *
    .param K1=1
    .param PI =3.141592654
    **********
    **********
    **********K1=1 when Frequency in Herz
    **********K1 =1e6 when Frequency in MHz
    **********
    **********
    *
    *
    .ends

    I need this info to test a HV Filter.

    Thanks,
    Bala
     
  4. LvW

    LvW

    604
    143
    Apr 12, 2014
    Perhaps, this is not what the OP (Bala_01) needs - but there is a very versatile active circuit called "Frequency-Dependent Negative Resistor (FDNR) " consisting of two opamps. Such a device is extensively used in active filters and harmonic oscillators. It is a special version of the universal GIC circuit.
     
  5. Alec_t

    Alec_t

    2,686
    710
    Jul 7, 2015
    Can't you just right-click on the resistor value in the schematic and set the value to {2*frequency} ? Then add a directive .param frequency=3meg (or whatever).
     
    Bala_01 likes this.
  6. Bala_01

    Bala_01

    6
    0
    May 30, 2016
    I need a Pspice netlist model which I can import in CST DS.
     
  7. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    648
    May 8, 2012
    Ha, I know that this is not what you meant but attempting to use a wire-wound resistor as a 50Ω RF Dummy-Load comes close to fitting the definition. :D

    Chris
     
    Arouse1973 likes this.
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