Convergence Guide for PSpice

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Convergence Guide for PSpice

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Convergence Guide for PSpice

  1. 1. PSpice Simulation Convergence Guide All Rights Reserved Copyright (C) Bee Technologies Corporation 2014 1 Bee Technologies http://www.bee-tech.info/ 27MAR2014 Tsuyoshi Horigome
  2. 2. PSpice Simulation Convergence Guide • .OPTION setting guide • PSpice Standard Default • Simulation Convergence  Quick Fix • Maximum Step Size • SKIPBP All Rights Reserved Copyright (C) Bee Technologies Corporation 2014 2
  3. 3. .OPTION setting guide (1/2) .OPTIONS Default Suggestion Explanation RELTOL 0.001 0.01 • Increase simulation speed by 10 to 50% VNTOL 1u 1m • Aid convergence but reduce the voltage accuracy ABSTOL 1p 1n, 1u or Increase to 10u • Aid convergence but reduce the current accuracy • Should be 8 order of magnitude below the level of the maximum current (ABSTOL < I[MAX]/108) CHGTOL 0.01p 0.01u • If capacitor are in order of Farad, increase CHGTOL by six order of magnitude GMIN 1E-12 1E-9 ~ 1E-8 • Please note that Vswith model parameter ROFF is limited by 1/GMIN All Rights Reserved Copyright (C) Bee Technologies Corporation 2014 3
  4. 4. .OPTION setting guide (2/2) .OPTIONS Default Suggestion Explanation ITL1 150 200, 400, 500 • This increases the number of DC iterations that PSpice will perform before it gives up. • In the complex circuit, further increases in ITL1 (e.g. 1000) won’t aid convergence. ITL2 20 50, 100, 200 • This increases the number of DC iterations that PSpice will attempt before it gives up. ITL4 10 40, 100, or 500 • This increases the number of transient iterations that PSpice will attempt at each time point before it gives up. • Values greater than 100 won’t usually bring convergence All Rights Reserved Copyright (C) Bee Technologies Corporation 2014 4
  5. 5. PSpice Standard Default All Rights Reserved Copyright (C) Bee Technologies Corporation 2014 5 .OPTIONS  RELTOL=0.001  VNTOL=1.0u  ABSTOL=1.0p  CHGTOL=0.01p  GMIN=1.0E-12  ITL1=150  ITL2=20  ITL4=10
  6. 6. Simulation Convergence  Quick Fix All Rights Reserved Copyright (C) Bee Technologies Corporation 2014 6 .OPTIONS  RELTOL=0.01  VNTOL=1.0m  ABSTOL=1.0n  CHGTOL=0.01u  GMIN=1.0E-12  ITL1=500  ITL2=200  ITL4=100
  7. 7. Maximum Step Size All Rights Reserved Copyright (C) Bee Technologies Corporation 2014 7 • To increase (or decrease in some cases) the Maximum step size might help the simulation to complete – e.g. Increase the Maximum step size from 10n to 100n can cause the simulation to complete.
  8. 8. SKIPBP Skipping the bias point Check the SKIPBP option to skip the bias point calculation for the transient analysis Please note that this setting should be used as a last resort if there is trouble getting the transient analysis to start because the DC operating point can’t be calculated. All Rights Reserved Copyright (C) Bee Technologies Corporation 2014 8

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