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PSpice Output File Device

Discussion in 'CAD' started by Bob Penoyer, May 27, 2005.

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  1. Bob Penoyer

    Bob Penoyer Guest

    Is there an output device that will allow a single circuit parameter
    to be written to a file?

    I know that VPWL_FILE can be used to read an ASCII file of two
    columns, time and voltage.
     
  2. Jim Thompson

    Jim Thompson Guest

    The ".PRINT" statement can print-to-file most anything.

    What did you have in mind? Your problem statement is somewhat muddy
    ;-)

    ...Jim Thompson
     
  3. Bob Penoyer

    Bob Penoyer Guest

    I use Capture. How do I invoke the .PRINT statement?

    I have a fairly large circuit that is having convergence problems. The
    various parts ran all right when they were in their own projects. Now
    the presence of a particular amplifier circuit has somehow affected
    convergence in other parts of the overall circuit.

    As one possible approach to this apparent dilema, I have considered
    running the various sections separately so that one section's output
    can be saved to a file and another section can read that file. That
    way I hope to limit PSpice's computational load and maybe avoid the
    convergence problem.
     
  4. Jim Thompson

    Jim Thompson Guest

    Poor bastard ;-)
    In PSpice Schematics it's just Get Part "Print1" or "PrintData", but I
    couldn't find it in Capture.

    You can also capture a PWL file directly from Probe by copying and
    pasting into a text file, or Excel for that matter.
    Irrespective of what the Cadence types will tell you, set the
    following:

    ITL1=1500, ITL2=2000, ITL4=1000

    Also set:

    VNTOL=10uV
    ABSTOL=10pA
    RELTOL=0.01

    Check the STEPGMIN box.

    Might also try checking the SKIPBP box.
    Sometimes that works. My general experience is that PSpice failing to
    converge means you have a nearly unstable system.

    ...Jim Thompson
     
  5. Another approach to take is too look for daft signals. Large voltages
    or currents etc. Then add some circuit parasitics to reduce these.
    Convergence problems can be due to an unrealistic circuit, too simple
    models. Sometimes just adding loads to batteries (i.e. increasing
    standing current) can be enough to fix things.


    --

    Malcolm

    Malcolm Reeves BSc CEng MIEE MIRSE, Full Circuit Ltd, Chippenham, UK
    (, or ).
    Design Service for Analogue/Digital H/W & S/W Railway Signalling and Power
    electronics. More details plus freeware, Win95/98 DUN and Pspice tips, see:

    http://www.fullcircuit.com or http://www.fullcircuit.co.uk

    NEW - www.CharteredConsultant.co.uk - The Consultant A-List
     
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