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Re: gEDA-user: Frequency Response

On Tue, May 17, 2005 at 12:52:57AM +0200, Davide Anastasia wrote:
> Il giorno lun, 16-05-2005 alle 21:24 +0200, Leva ha scritto:
> > ..of what?
> 
> I've got only a schematic... It's possible to perform this task with
> Spice?

Yes... Most certainly. The best tutorial on the topic of getting a
netlist from gschem to run in SPICE is probably:

http://www.brorson.com/gEDA/SPICE/t1.html

Basically what you need to get out of the netlister is something like
this:


--------------------------------------
Test Circuit
Vin in 0 DC 0 AC 1.0
L1  in out 10e-6
C1  out 0  10e-9
R1  out 0  100

.ac dec 100 1 100meg
.plot ac vdb(out) xlog
.end
--------------------------------------

Then run this file in some kind of spice simulator. Using original
Berkeley spice it goes something like this:

laptop daniel/tmp> spice3 test.sp
Program: Spice, version: 3f5
Date built: Fri Sep 17 21:45:05 EDT 2004

Type "help" for more information, "quit" to leave.


Circuit: Test Circuit

Spice 11 -> run
Spice 12 -> plot vdb(out) xlog
Spice 13 -> quit
Warning: the following plot hasn't been saved:
ac1     Test Circuit, AC Analysis

Are you sure you want to quit (yes)? yes
Spice-3f5 done

Or, in batch mode:

laptop daniel/tmp> spice3 -b -r test.raw test.sp

Circuit: Test Circuit

Circuit: Test Circuit
Date: Mon May 16 21:04:27  2005


.plot line ignored since rawfile was produced.
CPU time since last call: 0.040 seconds.

Total CPU time: 0.040 seconds.

Current dynamic memory usage = 135168,
Dynamic memory limit = -258049.


laptop daniel/tmp> nutmeg test.raw
Program: nutmeg, version: 3f5
Date built: Fri Sep 17 21:45:13 EDT 2004

Type "help" for more information, "quit" to leave.

Loading raw data file ("test.raw") . . . done.
Title:  Test Circuit
Name: AC Analysis
Date: Mon May 16 21:04:27  2005

nutmeg 4 -> plot vdb(out)
nutmeg 5 -> quit
nutmeg-3f5 done

You can also use gwave instead of nutmeg to view the results, but I'm
not sure how to get the dB plot in gwave.

Hope that helps

Daniel