geda:ngspice_and_gschem
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geda:ngspice_and_gschem [2012/02/20 15:14] 127.0.0.1 external edit |
geda:ngspice_and_gschem [2014/04/18 12:23] (current) vzh Add link to Russian translation |
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| + | //Translations of this page are also available in the following languages:// [[ngspice_and_gschem.ru|Русский]]. | ||
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| ====== Overview ====== | ====== Overview ====== | ||
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| ====== Setup ====== | ====== Setup ====== | ||
| - | It is assumed that you are able to construct schematics with gschem. If you are unsure how to do this please visit [[gsch2pcb_tutorial]]. So let's start by making a project directory 'simpleSPICE' and creating a schematic file named | + | It is assumed that you are able to construct schematics with gschem. If you are unsure how to do this please visit [[gsch2pcb_tutorial]]. So let's start by making a project directory 'simpleSPICE' and creating a schematic file named |
| 'simplespice.sch' in that directory. | 'simplespice.sch' in that directory. | ||
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| {{geda:simple1.png}} | {{geda:simple1.png}} | ||
| - | Note that three named nets have been created, "Vin", "Vout", and "Vbase". Although this is not necessary, it is an easy way to keep track of important points in the circuit. Naming nets is done by editing either by right-clicking or by hitting 'ee' while a net is selected; then just add the attribute 'netname' and give it an appropriate name. Although we now have a circuit to simulate, we need to add some SPICE specific information before we can get any results. | + | Note that three named nets have been created, "Vin", "Vout", and "Vbase". Although this is not necessary, it is an easy way to keep track of important points in the circuit. Naming nets is done by editing either by right-clicking or by hitting <key>e</key><key>e</key> while a net is selected; then just add the attribute 'netname' and give it an appropriate name. Although we now have a circuit to simulate, we need to add some SPICE specific information before we can get any results. |
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| ====== Adding some SPICE stuff ====== | ====== Adding some SPICE stuff ====== | ||
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| + Tr=239.5n Tf=301.2p Itf=.4 Vtf=4 Xtf=2 Rb=10) | + Tr=239.5n Tf=301.2p Itf=.4 Vtf=4 Xtf=2 Rb=10) | ||
| * Fairchild pid=23 case=TO92 | * Fairchild pid=23 case=TO92 | ||
| - | * 88-09-08 bam creation | + | * 88-09-08 bam creation |
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| which will spew a great deal of text to 'result.txt'. The file should include the numerical output we requested as well as a crude ascii plot of the results. Note that the 10mV input signal has been amplified to about -280mV over a wide frequency range. If you want to view graphical plots ngspice can be operated in interactive mode by removing the -b option. The ngspice website describes this in more detail. In any event, we now have the simulation results in a nice text format suitable for reading with a script, perhaps something written in python or octave, for further graphing or analysis. | which will spew a great deal of text to 'result.txt'. The file should include the numerical output we requested as well as a crude ascii plot of the results. Note that the 10mV input signal has been amplified to about -280mV over a wide frequency range. If you want to view graphical plots ngspice can be operated in interactive mode by removing the -b option. The ngspice website describes this in more detail. In any event, we now have the simulation results in a nice text format suitable for reading with a script, perhaps something written in python or octave, for further graphing or analysis. | ||
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geda/ngspice_and_gschem.1329768896.txt.gz · Last modified: 2013/05/08 04:20 (external edit)
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