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Spice simulation help

by ranger
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ranger
#1
Apr12-06, 08:29 PM
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I'm currently learning spice. I need help with a very simple circuit.


Here is the netlist:

Example netlist
v1 1 0 dc 15
r1 1 0 2.2k
r2 1 2 3.3k
r3 2 0 150
.end

When I run it in spice(2g6) I get:

******* 12/04/10 ********  SPICE 2G.6    15/3/83 ******** 21:24:57 ****
**** EXAMPLE NETLIST                                                                 
****     INPUT LISTING                    TEMPERATURE =   27.000 DEG C
***********************************************************************


V1 1 0 DC 15    
R1 1 0 2.2K     
R2 1 2 3.3K     
R3 2 0 150      

*ERROR*:  .END card missing


Input deck (file) contains no data.
The tutorial I am using says to do exactly that, but yet I get this error. As you can see I have .end in my netlist. Whats wrong?

--thank you.
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chroot
#2
Apr12-06, 08:36 PM
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Is it possible your version of spice is case-sensitive? Have you tried using .END instead of .end?

- Warren
ranger
#3
Apr12-06, 08:56 PM
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I still get the same error with .END

Its weird though, doing a simple RC example netlist:

Basic RC circuit
r 1 2 1.0
*l 1 2 1.0
c 2 0 1.0
vin 1 0 pulse (0 1) ac 1
.tran 0.1 7.0
*.ac dec 10 .01 10
.plot tran v(2) i(vin)
*.plot ac vdb(2) xlog
.end

The simulation goes about just fine.

berkeman
#4
Apr12-06, 10:24 PM
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Spice simulation help

Example netlist
v1 1 0 dc 15
r1 1 0 2.2k
r2 1 2 3.3k
r3 2 0 150
.end
Looks like it should work. I'll run it tomorrow at work (I'm at home now) to see what happens. In the mean time, are there any hidden characters maybe in the file? Some goofy ctrl-oops character that crept in?


PS -- Very cool links in your footer. I'll have to spend some time browsing those pages more....
ranger
#5
Apr13-06, 08:47 AM
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Looks like it should work. I'll run it tomorrow at work (I'm at home now) to see what happens. In the mean time, are there any hidden characters maybe in the file? Some goofy ctrl-oops character that crept in?

Unfortunately they arent any. At first I simply copied the netlist, but after I typed them out and saved them in a new file, I still get the same error.
berkeman
#6
Apr13-06, 10:30 AM
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You text file runs fine in my MicroCAP8 SPICE simulator. I copied your text from your post and pasted it into an input file, and ran a transient analysis. MC8 ended up with this file after the transient analysis:

Example netlist
v1 1 0 dc 15
r1 1 0 2.2k
r2 1 2 3.3k
r3 2 0 150
.TRAN 2e-008 1u 0
.TEMP 27
.PLOT TRAN v(1) v(2) 0,37.5
.end
ranger
#7
Apr13-06, 10:43 AM
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Using your netlist with .TRAN, etc. I still get the same error. Mayb there us something wrong with the program?

I got the program from here (towards the bottom of the page).

V1 1 0 DC 15
R1 1 0 2.2K
R2 1 2 3.3K
R3 2 0 150
.TRAN 2E-008 1U 0
.TEMP 27
.PLOT TRAN V(1) V(2) 0,37.5

*ERROR*: .END card missing
Its like it refuses to read .END

What OS are you running SPICE on? Is MicroCAP8 SPICE free?
berkeman
#8
Apr13-06, 10:48 AM
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I've run MicroCAP on NT and XP. This current MC8 installation is running on my XP PC. I don't know if there is a lower-cost student version of MicroCAP, but you could check Spectrum Software's website:

http://www.spectrum-soft.com/index.shtm

Have you looked in the Help menu of your program to see if it requires something special for the .end statement? Does it come with any sample files? Do you have any friends who are also using that program?
ranger
#9
Apr13-06, 10:55 AM
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Have you looked in the Help menu of your program to see if it requires something special for the .end statement? Does it come with any sample files? Do you have any friends who are also using that program?
There is no help file, all I was told to download were three files (no help or samples). All of my friends are using multisim instead :)

I've found a sample netlist (elsewhere):
Basic RC circuit
r 1 2 1.0
*l 1 2 1.0
c 2 0 1.0
vin 1 0 pulse (0 1) ac 1
.tran 0.1 7.0
*.ac dec 10 .01 10
.plot tran v(2) i(vin)
*.plot ac vdb(2) xlog
.end
SPICE can simulate this circuit though.
pervect
#10
Apr13-06, 02:26 PM
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Try adding an .op card to your first netlist. You didn't really instruct the program to do an analysis, that might be the problem.
ranger
#11
Apr13-06, 03:00 PM
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Quote Quote by pervect
Try adding an .op card to your first netlist. You didn't really instruct the program to do an analysis, that might be the problem.
Example netlist
V1 1 0 DC 15
R1 1 0 2.2K
R2 1 2 3.3K
R3 2 0 150 
.end
.op
Output:
******* 13/04/10 ********  SPICE 2G.6    15/3/83 ******** 15:55:19 ****
**** MULTIPLE DC SOURCES                                                             
****     INPUT LISTING                    TEMPERATURE =   27.000 DEG C
***********************************************************************


V1 1 0 DC 15    
R1 1 0 2.2K     
R2 1 2 3.3K     
R3 2 0 150      
.END    




******* 13/04/10 ********  SPICE 2G.6    15/3/83 ******** 15:55:19 ****
**** MULTIPLE DC SOURCES                                                             
****     SMALL SIGNAL BIAS SOLUTION       TEMPERATURE =   27.000 DEG C
***********************************************************************

 NODE   VOLTAGE     NODE   VOLTAGE

(  1)   15.0000    (  2)    0.6522


    VOLTAGE SOURCE CURRENTS

    NAME       CURRENT

    V1       -1.117E-02

    TOTAL POWER DISSIPATION:   1.67E-01 WATTS

         JOB CONCLUDED

         TOTAL JOB TIME            0.01
That did the job! It works. Its funny how the guy that wrote the tutorial didnt mention this. What is .op for pervect? Thanks.
chroot
#12
Apr13-06, 05:03 PM
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I suspect that you may actually need a newline character after the .end.... i.e., the last line of the file should be blank. Worth a try, yes?

.op runs an operating-point (bias point) analysis.

- Warren
ranger
#13
Apr13-06, 05:29 PM
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Quote Quote by chroot
I suspect that you may actually need a newline character after the .end.... i.e., the last line of the file should be blank. Worth a try, yes?


- Warren
That newline did the trick.


******* 13/04/10 ********  SPICE 2G.6    15/3/83 ******** 18:27:58 ****
**** EXAMPLE NETLIST                                                                 
****     INPUT LISTING                    TEMPERATURE =   27.000 DEG C
***********************************************************************


V1 1 0 DC 25    
R1 1 0 2.2K     
R2 1 2 7.3K     
R3 2 0 150      
.END    




******* 13/04/10 ********  SPICE 2G.6    15/3/83 ******** 18:27:58 ****
**** EXAMPLE NETLIST                                                                 
****     SMALL SIGNAL BIAS SOLUTION       TEMPERATURE =   27.000 DEG C
***********************************************************************

 NODE   VOLTAGE     NODE   VOLTAGE

(  1)   25.0000    (  2)    0.5034


    VOLTAGE SOURCE CURRENTS

    NAME       CURRENT

    V1       -1.472E-02

    TOTAL POWER DISSIPATION:   3.68E-01 WATTS

         JOB CONCLUDED

         TOTAL JOB TIME            0.00




******* 13/04/10 ********  SPICE 2G.6    15/3/83 ******** 18:27:58 ****
****                                                                                 
****     INPUT LISTING                    TEMPERATURE =   27.000 DEG C
***********************************************************************



*ERROR*:  .END card missing
It still says that .end is missing. But the simulation goes through though.


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