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Nexxim Simulator >
Nexxim DC Analysis >
DC Analysis Technical Notes >
Nexxim DC Analysis Convergence Criteria

Nexxim DC Analysis Convergence Criteria

After each Newton-Raphson iteration, the simulator uses two criteria to determine whether the solution meets required tolerances: the delta check and the function check. The delta check guarantees that the solution converges within the voltage tolerances set by options reltol (relative voltage and current tolerance) and vntol (absolute voltage tolerance). The function check guarantees that the solution satisfies the nonlinear equations within the current tolerances set by options reltol and abstol (absolute current tolerance).

In addition, solving nonlinear circuits may require limiting the size of voltage changes at each Newton-Raphson iteration.

Delta Check

Function Check

Limiting Step

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