Home

Spice

1. However if there are spaces in these names it won t work Hence v 1 2 and 5 5 aren t recognised BJT s can have either 3 or 4 nodes which makes it difficult for the subcircuit expansion routines to decide what to rename If the fourth parameter has been declared as a model name then it is assumed that there are 3 nodes otherwise it is considered a node To disable this kludge you can set the variable nobjthack which will force BJT s to have 4 nodes for the purposes of subcircuit expansion at least The name param notation might not work with trace iplot etc yet The first line of a command file except for the spiceinit file should be a comment Otherwise SPICE may create an empty circuit structure CAVEATS SPICE3 files specified on the command line are read in before the spiceinit file is read Thus if you define aliases there that you call in a SPICE3 source file mentioned on the command line they won t be recognised VMS NOTES The standard suffix for rawspice files in VMS is raw You may have to redefine the value EDITOR if you wish to use the edit command since the default for VMS is vi Parent Directory
2. be run if they are not parsed nosubckt Don t expand subcircuits renumber Renumber input lines when a deck has include s subend The card to end subcircuits normally ends subinvoke The prefix to invoke subcircuits normally x substart The card to begin subcircuits normally subckt There are a number of rusage parameters available in addition to the ones available in nutmeg If there are subcircuits in the input file SPICE3 expands instances of them A subcircuit is delimited by the cards subckt and ends or whatever the value of the variables substart and subend is respectively An instance of a subcircuit is created by specifying a device with type x the device line is written xname nodel node2 subckthname where the nodes are the node names that replace the formal parameters on the subckt line All nodes that are not formal parameters are prepended with the name given to the instance and a as are the names of the devices in the subcircuit If there are several nested subcircuits node and as the prefix that specifies instances of subcircuits instead of x SEE ALSO nutmeg 1 sconvert 1 spice 1 mfb 3 writedata 3 SPICE3 User s Guide AUTHORS SPICE3 Tom Quarles quarles cad berkeley edu nutmeg User interface Wayne Christopher faustus cad berkeley edu BUGS SPICE3 will recognise all the notations used in SPICE2 plot cards and will translate vp 1 into ph v 1 and so forth
3. not available unless the standard input is a terminal however r rawfile or R rawfile Use rawfile as the default file into which the results of the simulation are saved Further arguments are taken to be SPICE3 input decks which are read and saved If batch mode is requested then they are run immediately SPICE3 will accept any SPICE2 input decks and output ascii plots fourier analyses and node printouts as specified in plot four and print cards If a out parameter is given on a width card the effect is the same as set width Since SPICE3 ascii plots do not use multiple ranges however if vectors together on a plot card have different ranges they will not provide as much information as they would in SPICE2 The output of SPICE3 is also much less verbose than SPICE2 in that the only data printed is that requested by the above cards Vector names are the same as in nutmeg with this addition a name such as name param where name is either the name of a device instance or model denotes the value of the param parameter of the device or model See the SPICE3 User s Manual for details of what parameters are available The value is a vector of length 1 This function is also available with the show command and is available with variables for convenience for command scripts SPICE3 commands are as follows these are only those commands not also available in nutmeg consult the nutmeg manual page for more commands setc
4. SPICE NAME spice circuit simulator SYNOPSIS spice n t term r rawfile b i input file DESCRIPTION This manual page describes the commands available for interactive use of SPICE3 For details of circuit descriptions and the process of simulating a circuit see the SPICE3 User s Manual The commands available are a superset of those available for nutmeg only the additional commands available in SPICE3 are described here You should be familiar with the manual page for nutmeg 1 before reading this manual page Arguments are n or N Don t try to source the file spiceinit upon startup Normally SPICE3 tries to find the file in the current directory and if it is not found then in the user s home directory t term or T term The program is being run on a terminal with mfb name term b or B Run in batch mode SPICE3 will read the standard input or the specified input file and do the simulation Note that if the standard input is not a terminal SPICE3 will default to batch mode unless the i flag is given s or S Run in server mode This is like batch mode except that a temporary rawfile is used and then written to the standard output preceded by a line with a single after the simulation is done This mode is used by the spice daemon i or D Run in interactive mode This is useful if the standard input is not a terminal but interactive mode is desired Command completion is
5. ine beginning with the characters is considered a control line This makes it possible to imbed commands in SPICE3 input files that will be ignored by earlier versions of SPICE Note in spice3a7 and before the control and endc lines were not needed and any line beginning with the name of a front end command would be executed linearize vec Create a new plot with all of the vectors in the current plot or only those mentioned if arguments are given The new vectors will be interpolated onto a linear time scale which is determined by the values of tstep tstart and tstop in the currently active transient analysis The currently loaded deck must include a transient analysis a tran command may be run interactively before the last reset alternately and the current plot must be from this transient analysis This command is needed because SPICE3 doesn t output the results from a transient analysis in the same manner that SPICE2 did There are several set variables that SPICE3 uses but nutmeg does not They are editor The editor to use for the edit command modelcard The name of the model card normally model noaskquit Do not check to make sure that there are no circuits suspended and no plots unsaved Normally SPICE3 will warn the user when he tries to quit if this is the case nobjthack Assume that BJT s have 4 nodes noparse Don t attempt to parse decks when they are read in useful for debugging Of course they cannot
6. irc circuit name Change the current circuit The current circuit is the one that is used for the simulation commands below When a circuit is loaded with the source command see below it becomes the current circuit op op card args Do an operating point analysis tran tran card args Do a transient analysis ac ac card args Do an ac analysis dc dc card args Do a dc transfer curve analysis listing logical physical deck expand Print a listing of the current circuit If the logical argument is given the listing is with all continuation lines collapsed into one line and if the physical argument is given the lines are printed out as they were found in the file The default is logical A deck listing is just like the physical listing except without the line numbers it recreates the input file verbatim except that it does not preserve case If the word expand is present the circuit will be printed with all subcircuits expanded edit file Print the current SPICE3 deck into a file call up the editor on that file and allow the user to modify it and then read it back in replacing the origonal deck If a filename is given then edit that file and load it making the circuit the current one resume Resume a simulation after a stop show Show a device parameter alter Alter a device parameter state Print the state of the circuit This command is largely unimplemented save all output or save al
7. l output Save a set of outputs discarding the rest If a node has been mentioned in a save command it will appear in the working plot after a run has completed or in the rawfile if spice is run in batch mode If a node is traced or plotted see below it will also be saved For backward compatibility if there are no save commands given all outputs are saved stop after n when something cond something Set a breakpoint The argument after n means stop after n iteration number n and the argument when something cond something means stop when the first something is in the given relation with the second something the possible relations being eq or equal to ne or lt gt not equal to gt or gt greater than It or lt less than ge or gt greater than or equal to and le or lt less than or equal to IO redirection is disabled for the stop command since the relational operations conflict with it it doesn t produce any output anyway The somethings above may be node names in the running circuit or real values If more than one condition is given e g stop after 4 when v 1 gt 4 when v 2 lt 2 the conjunction of the conditions is implied trace node Trace nodes Every iteration the value of the node is printed to the standard output iplot node Incrementally plot the values of the nodes while SPICE3 runs step number Iterate number times or once and then stop status Display al
8. l of the traces and breakpoints currently in effect delete debug number Delete the specified breakpoints and traces The debug numbers are those shown by the status command Unless you do status gt file in which case the debug numbers aren t printed reset Throw out any intermediate data in the circuit e g after a breakpoint or after one or more analyses have been done already and re parse the deck The circuit can then be re run Note this command used to be end in SPICE 3a5 and earlier versions end is now used for control structures The run command will take care of this automatically so this command should not be necessary run rawfile Run the simulation as specified in the input file If there were any of the control cards ac op tran or dc they are executed The output is put in rawfile if it was given in addition to being available interactively source file Read the SPICE3 input file file Nutmeg and SPICE3 commands may be included in the file and must be enclosed between the lines control and endc These commands are executed immediately after the circuit is loaded so a control line of ac will work the same as the corresponding ac card The first line in any input file is considered a title line and not parsed but kept as the name of the circuit The exception to this rule is the file spiceinit Thus a SPICE3 command script must begin with a blank line and then with a control line Also any l

Spice

Contents

Download Pdf Manuals

Related Search

Related Contents