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Pspice problem

  1. Jun 7, 2009 #1
    Hi guys, I'm having a problem simulating the following circuit:
    http://img194.imageshack.us/img194/986/labtcfe.jpg [Broken]

    I want to set those zener diodes to have a reverse biased voltage of 9.1V and forward biased of 1.2V but I don't know how to do it.

    The second problem, is that I can't see, when I simulate, the Graph of those 2 V marks versus the time.

    Can Someone help me out plz? I've attached the .sch file.

    Thx :)

    Edit: Just noticed that R2 and R3 are switched. R2= 10k and R3=20.6k
     

    Attached Files:

    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Jun 8, 2009 #2

    berkeman

    User Avatar

    Staff: Mentor

    Here's the way to do it in MicroCAP SPICE. PSPICE may be similar. Is there anything in the Help files or application notes at the PSICE website?

    http://www.spectrum-soft.com/news/fall2000/zenermodel.shtm

    Alternately, you can do it as described in "Semiconductor Device Modelling with SPICE" by Antognetti and Massobrio. They build a macromodel with a DC voltage source in series with a standard diode in the forward direction (anode to cathode), and a DC voltage source in series with a diode and resistor in the reverse breakdown direction.
     
  4. Jun 8, 2009 #3
    Thx for the help, I will check it out :)
    I didn't find much support on PSpice website about this...
     
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