[LT-Spice help]Modifying properties of nodes!

Discussion in 'General Electronics Chat' started by rameez787, Aug 16, 2011.

  1. rameez787

    Thread Starter New Member

    Aug 16, 2011
    2
    0
    Hi All,

    I am using LT-Spice to simulate a circuit based on parallel and series resistances.

    I want to define additional (fixed) resistance on each node. That is, in every circuit when two components are connected there is additional contact resistance.

    I want to put this contact resistance in my circuit.

    Is there a way in LT-Spice to define somewhere a resistance of node itself?

    Regards
    Rameez
    Friedrich Alexander University Erlangen
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Not with just wire.

    However, you can add an inductor, and enter appropriate inductance and parasitic values of series and parallel resistance, and parallel capacitance.

    You could also use a capacitor, as it has parameters for not only capacitance, but:
    Equiv. Series Resistance
    Equiv. Series Inductance
    Equiv. Parallel Resistance
    Equiv Parallel Capacitance
     
  3. rameez787

    Thread Starter New Member

    Aug 16, 2011
    2
    0
    Thanks,

    My circuit is only resistances like

    r1 0 2352342 234234
    r2 2352342 2342323 32423
    r3 234232 7634345 34533
    V1 0 7634345 0.5
    .op
    .end

    and I calculate total resistance of circuit....

    now on each node I want to put a resistance of 10ohms .... how can I put an inductor/capacitor that it does not effect the net result
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Nodes themselves do not have any characteristics of capacitance, resistance, inductance, or any other parasitics. They are perfect zero-Ohm connections. A node can be spread all over on a schematic or in a SPICE netlist, but it is a single point.

    If you want to add some parasitic resistance, you will have to add single resistors between each component connection to each node. This will result in creating new nodes between the original components and the original node.

    If you only want to specify resistance, then just use a resistor.
     
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