Part 3 - SmartSpice Convergence Tips
Contents
1. SmartSpice Training Program Part 3 SmartSpice Convergence Tips 6 20 06 DESIGN AUTOMATION Basics to Convergence SmartSpice starts with Operating Point Calculations during DC Operating Point amp DC Sweep Analyses Transient Analysis without UIC SmartSpice constructs system equations and solves them using Newton Raphson method SmartSpice Training Program Part 3 2 MM osen AUTOMATIO Auto Convergence Algorithm Process 5 Levels Start Standard Newton Iterati TELT 7 CONV 0 iteration up to ITL1 limit default 100 er EXIT Converged ee Se ek ee l N CONV 1 or 3 ramps DCGMIN with o multiplying the factor by 0 1 from I I DCGMIN stepping qu a DCGMIN 10 COMSTEPS to DCGMIN l I I I l iteration up to 4 3 ITL2 limit at basic steps Yes Converged N and up to ITL2 limit at additional steps EXIT f E ee I o CONV 2 Ramps Jacobi Matrix diagonal increment DiagGMIN stepping q 8228 DiagGMIN with multiplying the factor by 0 1 1 from GMIN 10S NSTEPS to GMIN i Yes EXIT Converged No fae A a 1 Source stepping q a CONV 4 i Ramps Source values by adding the factor of Vsource SRCSTEPS I from 0 to Vsource I meme m l EXIT Yes Converged No SmartSpice Training Program Part 3 3 m rt SIMUCAD DESIGN AUTOMATION DC OP Analysis Convergence Aids DCGMIN conductance 1e 12 is placed in all PN jun2. ction active devices Auto convergence algorithm process Five levels to achieve good convergence Convergence Options E ACCEPT CONV DCGMIN DCPATH EXPERT 777 779 amp 11 GMIN a ITL1 Model Solver related Option E PIVTOL Initial Condition NGDESELT IG SIMUCAD SmartSpice Training Program Part 3 4 Transient Analysis Options Convergence amp Options CNODE 1le 8 DCPATH 1 GMIN GNODE NEWTOL Time step too small OPTIONSET 3 OPTIONSET 4 SmartSpice Training Program Part 3 5 5 SIMUCAD DESIGN AUTOMATION Aids in Overcoming Non Convergence Remove all options except EXPERT 777 LIST ACCT Allow SmartSpice auto convergence to proceed Check the diagnostics detail provided by SmartSpice Check Warning amp Error message printed from SmartSpice Make corrections circuit topology node check unit setting so on Run the simulation Use Control Options During transient analysis you can try TRANOP or UIC Re run the simulation SIMUCAD SmartSpice Training Program Part 3 6 Notes and Restrictions for Using Control Options Ex stopcont options is not available under batch mode Ex probe options only be valid with post Ex Convergence and accuracy options depends on analyses type Ex Negative Conductance Model related Options GMINDC value GMIN value If the lt value gt gt 1
3. e 8 consult your model provider Please refer for more detail to SmartSpice User s manual To achieve Higher Accuracy and overcome the Non Convergence issue it is highly recommend to run SmartSpice before using any options SIMUCAD SmartSpice Training Program Part 3 7
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