SimOne (Eremex)

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The new version of SimOne 1.2.1 Beta is now available
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SimOne includes the Capture schematic editor, which performs all tasks associated with schematic reading and editing, component selection, and simulation control. The modeling engine is a software module that runs modeling operations, controls the display of results and provides options for data post-processing.

The following circuit analyses are available in SimOne:

  1. DC analysis: Includes operating point calculation and direct current transfer functions determination. A selection of methods is available for solving nonlinear algebraic equations: Newton–Raphson, Damped Newton–Raphson, Gmin Stepping, Junction Gmin Stepping, Source Stepping.
  2. AC analysis: Calculates and displays the circuit’s frequency characteristics, including Nyquist plot.
  3. Transient analysis: Uses an original method for integrating differential algebraic equations. This method has enhanced precision and stability compared to the methods used in SPICE modeling. Calculations that use traditional SPICE modeling methods — Gear, trapezoidal, Euler — are performed by the code matrix processor, which speeds up processing considerably.
  4. PSS analysis: Periodic behavior of the circuit is calculated using the Shooting Newton method while maintaining a matrix-free approach: no sensitivity matrix is created explicitly. Systems of linear equations are solved using the GMRES iterative Krylov subspace method.
  5. Temperature sweep (.TEMP): Models the behavior of the circuit under variation of operating temperature.
  6. Parameter sweep (.PARAM): Models the behavior of the circuit under variation of parameters of input signals and component models.
  7. Stability analysis: Two independent options are available for analyzing the circuit stability in the neighborhood of the operating point: using circuit’s eigenfrequencies or Mikhailov criterion. The result of the analysis is an estimation of the circuit’s stability, a plotted Mikhailov hodograph and a table of the circuit’s eigenfrequencies. You can also plot a partial Mikhailov hodograph for a specified frequency range and estimate stability yourself.

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