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Ultrasim simulator Problem

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I built a simple resistive ladder for voltage divider circut with componenets in analogLib. When I tried to simulate this circuit with Ultrasim simulator, the intermediate nodes failed to show the output waveform excepting ground and supply nodes. I added them in the outputs list,tried save all method but none of them worked. It happened with both SPICE and Spetre netlisting formats. I tried this simple circuit when a complex circuit failed to simulate properly. Hence now I find that the resistor is not identified properly in the Ultrasim simulation. Is there any known solution for this probelm??

Thanks in advance for your suggestions


Originally posted in cdnusers.org by gunturikishore28
Parents

  • After testing with a number of expressions I found that when I am including the voltage coefficients in the spectre expression, the resistors are failing to simulate correctly. Hence my conclusion is that the simulator is trying for a static value for the resistor for its optimiztions, where as node voltages are computed dynamically. Hence the resistor is rounded to zero when it is not able to compute the expression and hence removed from the circuit.


    Originally posted in cdnusers.org by gunturikishore28
Reply

  • After testing with a number of expressions I found that when I am including the voltage coefficients in the spectre expression, the resistors are failing to simulate correctly. Hence my conclusion is that the simulator is trying for a static value for the resistor for its optimiztions, where as node voltages are computed dynamically. Hence the resistor is rounded to zero when it is not able to compute the expression and hence removed from the circuit.


    Originally posted in cdnusers.org by gunturikishore28
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