ID:	4209
From:	stefan <st...@gmail.com>
Date:	Tue, 23 Jun 2020 08:38:33 +0200
Subject:	Re: [pcb-rnd] Off topic (maybe) - Spice simulator
in-reply-to:	4202 from Robin Laing <Me...@TelusPlanet.net>
replies:	4212 from Anthony Tuttle <ke...@gmail.com>

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    <blockquote type="cite"
      cite="mid:2e99427e-792d-6a1e-872f-9b898f37cbac@TelusPlanet.net">Hello,
      <br>
      <br>
      I am involved with a project that will involve high voltage pulse
      <br>
      circuit design and I am looking for a circuit simulator that will
      give
      <br>
      us an accurate representation of a circuit.
      <br>
      <br>
      Needs to work with spark gap technology as that is the present
      design.
      <br>
      Maybe gas discharge tube as well.
      <br>
      <br>
      Presently one member of the team is trying to use Multisim from NI
      but I
      <br>
      am wondering if there may be a better package.
      <br>
      <br>
    </blockquote>
    NGSPICE developers are doing a good job, <br>
    ngspice netlists may contain capacitors, resistors, inductors with
    arbitrary expressions about their value.<br>
    Moreover the 'B source' allows any type of voltage/current source
    with arbitrary expressions.<br>
    <br>
    Combining these elements a model for a gas discharge/breakdown can
    be created. <br>
    The big issue is not the simulator itself, but the quality of the
    model:<br>
    <br>
    1) ability to accurately describe the device.<br>
    2) simulator must converge to a solution.<br>
    <br>
    Breakdown devices (devices with infinite resistance that start
    conducting with very low resistance when a voltage threshold is
    reached) are famous for giving convergence issues. This usually
    happen due to poor model description. A current limit must be
    included in the equations (no physical device can sustain 1e15 Amp
    of current :-) ).<br>
    <br>
    Stefan<br>
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