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THE SLIDE RULE OF SILICON DESIGN

Free Analog Circuit Simulation

Simulator Options

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** Options, defaults
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* Temperature
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* Nominal temperature
*.options tnom=27
*
* Operating temperature
*.options temp=27
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* Convergence and precision
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* Minimum conductance used in ac and transient domain
*.options gmin=1e-12
*
* Minimum conductance used in dc domain
*.options gmindc=1e-12
*
* Minimum resistance value for resistors
*.options resmin=1e-5
*
* Relative error tolerance
*.options reltol=1e-3
*
* Absolute error tolerance
*.options abstol=1e-12
*
* Voltage error tolerance
*.options vntol=1e-6
*
* Steady state analysis tolerance multiplicator
*.options sssetol=10
*
* Charge error tolerance
*.options chgtol=1e-14
*
* Truncation error overestimation factor
*.options trtol=7
*
* Minimum acceptable pivot
*.options pivtol=1e-13
*
* Minimum acceptable ratio of pivot
*.options pivrel=1e-3
*
* Type of timestep control
* lvltim=0 iteration count algorithm
* lvltim=1 dvdt algorithm
* lvltim=2 Berkeley's local truncation error algorithm
*.options lvltim=1
*
* Use simplified algorithm to calculate local truncation error
*.options newtrunc=not defined
*
* Maximum slope change used in dvdt timestep algorithm
*.options slopetol=0.75 (0.5 if lvltim is not set to 1)
*
* Maximum absolute solution change used in dvdt timestep algorithm
*.options absvar=0.5
*
* Maximum relative solution change used in dvdt timestep algorithm
*.options relvar=0.3
*
* Maximum relative truncation for local truncation error calculation
*.options relq=1e-3
*
* Relative current tolerance for local truncation error calculation
*.options ltereltol=0.01
*
* Absolute current tolerance for local truncation error calculation
*.options lteabstol=1e-6
*
* Maximal transient step multiplier
*.options rmax=5 (2 if lvltim is not set to 1)
*
* Minimal transient step multiplier
*.options rmin=1e-9
*
* Fraction of timestep for first time point
*.options fs=0.25
*
* Fraction by which timestep is multiplied in case of non-convergence
*.options ft=0.25
*
* Model voltage (vds, pn junction etc. voltages) limit during the iterations
*.options voltagelimit=1e30
*
* Check the matrix and right hand side entries and correct (limit) them in
* each iteration after circuit load
*.options matrixcheck=not defined
*
* Allow bypass of unchanging elements
*.options bypass=1
*
* DC iteration limit
*.options itl1=100
*
* DC transfer curve iteration limit
*.options itl2=50
*
* Lower transient iteration limit
*.options itl3=3
* also named
*.options imin=3
*
* Upper transient iteration limit
*.options itl4=10
* also named
*.options imax=10
*
* Total transient iteration limit (has no effect)
*.options itl5=xxx
*
* Number of source steps
* If srcsteps is less than one then no source stepping is performed
*.options itl6=10
* also named
*.options srcsteps=10
*
* Number of Gmin steps
* If gminsteps is less than one then no Gmin stepping is performed
*.options gminsteps=10
*
* Minimum capacitance used in Cmin stepping
* If cmin is less than or equal zero then no Cmin stepping is performed
*.options cmin=1e-12
*
* Number of Cmin steps
* If cminsteps is less than one then no Cmin stepping is performed
*.options cminsteps=10
*
* PZ iteration limit
*.options pziter=200
*
* Skip DC OP iterations, go directly to convergence aids
*.options noopiter=not defined
*
* Skip source lifting
* Cmin stepping is also not performed
*.options nosrclift=not defined
*
* Skip initial source lifting without cmins. Go directly to Cmin stepping
*.options noinitsrcl=not defined
*
* Print convergence aid messages
*.options opdebug=not defined
*
* Priority of gmin stepping algorithm
*.options gminpriority=1
*
* Priority of source stepping algorithm
*.options srcspriority=2
*
* Priority of source lifting algorithm
*.options srclpriority=3
*
* Maximum number of source lifting iterations
*.options srclmaxiter=5000
*
* Source lifting convergence test (number of constant iterations)
*.options srclconviter=50
*
* Number of source rising iterations (used only if scrlrisetime=0)
*.options srclriseiter=50
*
* Rise time in source lifting procedure
*.options srclrisetime=0
*
* Final stop time in source lifting procedure if convergence not achieved
*.options srclmaxtime=10
*
* Minimal step used in source lifting
*.options srclminstep=1e-15
*
* Allowed right hand side change per iteration in solution limiting
* If sollim is less than or equal zero then
* no solution limiting is performed
* if(abs(new rhs value - old rhs value) > tolerance)
* new rhs value = old rhs value +- tolerance / sollim
*.options sollim=10
*
* Allowed number of iterations in solution limiting
* If sollimiter is less than or equal zero then
* no solution limiting is performed
* DC iteration limit in solution limiting = sollimiter * itl1
*.options sollimiter=10
*
* Do not automatically set option values to achieve convergence
* when calculating operating point
*.options noautoconv=not defined
*
* Do not perform circuit topology verification during circuit setup
* (do not check for floating nodes in dc domain)
*.options nofloatnodescheck=not defined
*
* Do not double check convergence in Newton-Raphson algorithm
*.options noconviter=not defined
*
* Do not use predictor corrector method.
*.options nopredictor=not defined
*
* Integration method, trapezoidal or gear
* Note: Gear's algorithm also sets bypass to zero and lvltim to two
*.options method=trap
*
* Maximum integration order
*.options maxord=2
*
* Coefficient for the second order trapezoidal integration algorithm.
* It provides smooth transition from the second order (xmu=0.5) back to the
* first order (xmu=0) (Euler) algorithm.
* The range for xmu is 0 to 0.5.
*.options xmu=0.5
* also named
*.options mu=0.5
*
* Decreasing multiplier of xmu coefficient in
* case of numerical oscillations.
* The range for xmumult is 0 to 1.
* If xmumult=1 then decreasing of xmu is off.
*.options xmumult=0.8
* also named
*.options mumult=0.8
*
* Numerical oscillations detecting level to decrease xmu.
* trapratio has to be greater than 1.
*.options trapratio=10
*
* Print messages about trapezoidal integration method behaviour.
*.options integdebug=notdefined
*
* Denominator of first time step to solve the circuit at time t->0
* 0=off
*.options icstep=0
*
* the given nodesets
*.options nsfactor=1e10
*
* Number of iterations in which the nodeset factor gradually disappears
*.options nssteps=1
*
* Minimum time between breakpoints
*.options minbreak=no default
*
* Record operating point for each small-signal analysis
*.options keepopinfo
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* XSPICE options
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* Maximum analog/event alternations in DCOP
*.options maxopalter=nr_of_outputs_on_hybrids+1
*
* Maximum event iterations at analysis point
*.options maxevtiter=nr_of_event_driven_outputs+1
*
* Do not do analog/event alternation in DCOP
*.options noopalter
*
* Transient analysis supply ramping time
* 0=off
*.options ramptime=0
*
* Enable convergence assistance on code models
*.options convlimit
*
* Fractional step allowed by code model inputs between iterations
*.options convstep=0.25
*
* Absolute step allowed by code model inputs between iterations
*.options convabsstep=0.1
*
* Use auto-partial computation for all models
*.options autopartial
*
* Shunt resistance from analog nodes to ground
* If rshunt is not defined then no shunt resistances are added
*.options rshunt=not defined
*
* Shunt capacitance from analog nodes to ground
* If cshunt is less than or equal zero then no shunt capacitances are added
*.options cshunt=0
*
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* SPICE3 models
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* Default MOSfet length
*.options defl=100u
*
* Default MOSfet width
*.options defw=100u
*
* Default MOSfet area of drain
*
* Default MOSfet area of source
*.options defas=0
*
* Default MOSFET perimeter of drain
*.options defpd=0
*
* Default MOSFET perimeter of source
*.options defps=0
*
* Default number of MOSFET drain squares
*.options defnrd=0
*
* Default number of MOSFET source squares
*.options defnrs=0
*
* Default value for MOSFET model parameter check (bsmi3v3 only)
*.options defmodcheck=0
*
* Default value for MOSFET instance parameter check (bsmi3v3 only)
*.options definstcheck=0
*
* Scale factor for instance metric parameters
*.options scale=1
*
* Use old mos3 model (discontinuous with respect to kappa)
*
* Depletion capacitance equation selector
*.options dcap=1
*
* Try compaction for LTRA lines
*.options trytocompact
*
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* Obsolete
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* Print accounting
*.options acct
*
* Print a listing
*.options list
*
* Don't print a model summary
*.options nomod
*
* Don't insert page breaks
*.options nopage
*
* Print a node connection summary
*.options node
*
* Print a list of the options
*.options opts
*
* Use SPICE2 MOSfet limiting
*.options oldlimit
*
* Set number of digits printed
*.options numdgt
*
* Total cpu time in seconds
*.options cptime
*
* Time to reserve for output
*.options limtim
*
* Maximum points per analysis
*.options limpts
*
* Generate machine code
*.options lvlcod
*
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* totiter ... Total iterations
* traniter ... Transient iterations
* equations ... Circuit Equations
* tranpoints ... Transient timepoints
* accept ... Accepted timepoints
* rejected ... Rejected timepoints
* trancuriters ... Transient iters per point
*
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