SmartSpice Training Program
Contents
1. Convergence Options ACCEPT CONV DCGMIN DCPATH EXPERT 777 779 amp 11 GMIN ITL1 Model Solver related Option PIVTOL Initial Condition NODESET IC SILVACO SmartSpice Training Part 3 SmartSpice Convergence Tips 4 Analog Mixed Signal Simulation Transient Analysis Options Convergence amp Options CNODE 1le 8 DCPATH 1 GMIN GNODE NEWTOL Time step too small OPTIONSET 3 OPTIONSET 4 SILVACO SmartSpice Training Part 3 SmartSpice Convergence Tips 5 Analog Mixed Signal Simulation mea 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 SILVACO SmartSpice Training Part 3 SmartSpice Convergence Tips 6 Analog Mixed Signal Simulation MA 7 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 related2. Options GMINDC value GMIN value If the lt value gt gt 1e 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 SILVACO SmartSpice Training Part 3 SmartSpice Convergence Tips
3. SmartSpice Training Program egy MMIXed So A AM SILVACO Analog Mixed Signal Simulation 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 SILVACO SmartSpice Training Part 3 SmartSpice Convergence Tips 2 Analog Mixed SignalSi mulation wh 7 Auto Convergence Algorithm Process 5 Levels Start CONV 0 iteration up to ITL1 I limit I default 100 i CONV 1 or 3 ramps DCGMIN I with multiplying the factor by 0 1 l denne from DCGMIN 10PCGMSTEPS to l DCGMIN iteration up to 4 3 ITL2 I limit at basic steps and up to ITL2 Yes EXIT Converged limit at additional steps r No CONV 2 I Ramps Jacobi Matrix diagonal I CLEESE I increment l DiagGMIN with multiplying the factor by 0 1 from GMIN 10 MINSTEPS to dqunuug CONV 4 Ramps Source values by adding the factor of Vsource SRCSTEPS from 0 to Vsource I Non convergence diagnostic report SmartSpice Training Part 3 SmartSpice Convergence Tips 3 SILVACO Analog Mixed Signal und DC OP Analysis Convergence Aids DCGMIN conductance 1e 12 is placed in all PN junction active devices Auto convergence algorithm process Five levels to achieve good convergence
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