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Setting Up An Analysis<br />

Performing a DC Analysis During Transient Analysis<br />

Figure 6-1. DC Device Characteristics<br />

Related Topics<br />

Performing a DC Analysis During Transient Analysis<br />

Operating Point Analysis<br />

Differences Between DC and OP Analyses<br />

DC Convergence<br />

Improving DC Convergence<br />

DC Convergence Troubleshooting<br />

Performing a DC Analysis During Transient<br />

Analysis<br />

It is possible to perform a true DC analysis during a transient analysis. This can be useful in<br />

cases where the circuit is brought to a certain state through transient patterns and simulation, for<br />

example digitally programmed circuits. Specifying .DC with time specifications enables you to<br />

stop the transient, perform a true DC analysis, and continue the transient analysis. The true DC<br />

analysis is initialized with the transient state of the circuit at that time, and might converge to a<br />

slightly different state, due to the fact that any residual dynamic current will be eliminated (true<br />

DC analysis searches for a solution with static currents only). Also, when restarting, the<br />

dynamic currents are lost, so the occurrence of a DC analysis during a transient analysis<br />

potentially perturbates the exact transient trajectory. It is recommended to specify the DC<br />

analysis during transient analysis at times where the circuit is stabilized: in a state with no or<br />

very small residual dynamic currents.<br />

Eldo® User's Manual, 15.3 207

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