Pspice convergence problem

Thread Starter

mlkcampion

Joined Nov 16, 2006
59
Hey
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
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:
X_U1.DBK
 

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Ron H

Joined Apr 14, 2005
7,063
Hey
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
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:
X_U1.DBK
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?
 
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