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   Oscillator Analysis Technical Notes >
       Controlling Nexxim Oscillator Analysis >
           Controlling Convergence of Oscillator Analysis               

Controlling Convergence of Oscillator Analysis

Oscillator analysis involves circuits that may be highly nonlinear. The nonlinear_method option is provided to allow the user to select an alternative strategy if standard Newton-Raphson iteration fails to converge. Settings for the nonlinear_method option are newton, damped_newton, and descent.

osc.nonlinear_method=newton uses the standard algorithm, controlled by harmonic balance options. Default (standard Newton-Raphson) is the fastest and least robust (lowest probability of convergence)

osc.nonlinear_method=damped_newton checks the ΔV value at each step. If ΔV exceeds an internally-derived maximum, the iteration is rerun. The damped_newton method is intermediate in speed and robustness between the default and descent methods.

osc.nonlinear_method=descent uses the slope of the derivative as a guide to the direction for the next iteration. Descent is the slowest and most robust of the three methods.

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