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Ansoft Designer / Ansys Designer 在线帮助文档：

Nexxim Simulator >
Nexxim DC Analysis >
   DC Analysis Technical Notes >
       Nexxim DC Analysis/DC Continuation Strategies >
           Device Continuation               


Device Continuation

Device continuation (also called source stepping) attempts to reach convergence by initializing all voltage and current sources to values close to zero. In this condition, the initial guess of zero for all circuit values is a “correct” solution. Device continuation then attempts to reach convergence on the true solution by solving a sequence of circuits with progressively increasing source values.

For example, Figure 2 diagrams a circuit block diagram excited by a single 5V source, Vin.

Figure 2. Device Continuation Example

If NR fails to converge when Vin = 5V, source stepping may begin by trying to solve the circuit with Vin set to 1V. If that attempt converges, the solver uses that solution as the initial guess to a new circuit with Vin set to 2V, and tries NR again. This process repeats with Vin = 3V, Vin = 4V, and finally Vin = 5V. If each step converges, the fifth step with Vin = 5V is the correct solution and source stepping succeeds. If any step fails to converge, the device continuation fails. The device continuation algorithm for this example is diagrammed in Figure 3.

Figure 3. Device Continuation Algorithm for Example in Figure 2



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