Pspice convergence problem

Discussion in 'Electronics Resources' started by mlkcampion, Sep 19, 2007.

  1. mlkcampion

    Thread Starter Active Member

    Nov 16, 2006
    Trying to simulate a simple circuit, however Pspice keeps
    throwing up a convergence problem. I have noticed that i get this
    problem when i try to simulate with opamps also, when configured with
    feedback. I have read up about the convergence issue and try using some of the suggestions but still have a problem.
    The circuit i have posted is a milliohm meter i got of i think the EDN website, if someone could try simulating it in Orcad Capture and see what happens i would appreciate that.

    ERROR -- Convergence problem in transient analysis at Time = 7.366E-09
    Time step = 11.64E-21, minimum allowable step size = 20.00E-21
    These voltages failed to converge:
    V(X_U1.13) = 7.959V \ 7.925V
    V(X_U1.11) = -28.14V \ -30.61V
    These supply currents failed to converge:
    I(X_U1.ESC) = -1.203nA \ -1.298nA
    I(X_U1.EB) = -441.69uA \ -471.76uA
    I(V_V2) = -328.98uA \ -600.29uA
    These devices failed to converge:
  2. Distort10n

    Active Member

    Dec 25, 2006
    I don't know if there are PSpice gurus on this forum. Have you tried the Yahoo User's group for LTSPice?
  3. Ron H

    AAC Fanatic!

    Apr 14, 2005
    I don't think that will work with a PNP, and it probably won't converge for that reason. Try it with an NPN.
    How is it supposed to work?
  4. muz82

    New Member

    Feb 17, 2009
    i have the same problem as well...what does it means? Can somebody help?