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Message-ID:	<6a702c285f54d92e940b0351d8eb9453.squirrel@webmail.strucktower.com>
Date:	Thu, 15 Nov 2012 13:29:07 -0800
Subject:	[geda-help] New user help with gEDA- gschem, ngspice, and opamps
From:	keitho AT strucktower DOT com
To:	geda-help AT delorie DOT com
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Reply-To:	geda-help AT delorie DOT com

Hi All-

Just to understand how to do it, I put together a trivial circuit in
gschem. But ngspice gives me errors I don't understand.

Here's the errors:

*****
Circuit: * gnetlist -g spice-sdb --nomunge -i -o test1.net test1.sch

Error on line 14 : u8 1 2 vcc vee 2 tlv27x
Unable to find definition of model vee - default assumed

 unknown parameter (tlv27x)
*****

tlv27x is the name of my opamp model, which is loaded via a Spice Include
statement on the schematic in gschem. It is one section of a quad opamp,
TLV274, subckt taken from the datasheet.

I can't imagine why it doesn'recognize vee, it has no problem with vcc.

I see that gnetlist has designated my opamp with a "U" instead of an "X",
not sure what that suggests.

Here is a link to a png of the circuit:

http://www.strucktower.com/test1.png

Here's how I generated test1.net:

*****
keith AT t520:~/gaf$ gnetlist -g spice-sdb --nomunge -I -o test1.net test1.sch
Command line passed = gnetlist -g spice-sdb --nomunge -I -o test1.net
test1.sch
Loading schematic [/home/keith/gaf/test1.sch]
Using SPICE backend by SDB -- Version of 4.28.2007
schematic-type = normal schematic
keith AT t520:~/gaf$
*****

Here is the generated test1.net file:

*****
keith AT t520:~/gaf$ cat test1.net
* gnetlist -g spice-sdb --nomunge -I -o test1.net test1.sch
*********************************************************
* Spice file generated by gnetlist                      *
* spice-sdb version 4.28.2007 by SDB --                 *
* provides advanced spice netlisting capability.        *
* Documentation at http://www.brorson.com/gEDA/SPICE/   *
*********************************************************
.INCLUDE tlv27x.inc
*==============  Begin SPICE netlist of main design ============
.INCLUDE tlv27x.inc
Vin 3 0 ac 1 pulse( -1 1 1u 100n 100n 50u 100u)
R26 2 0 2K
R24 3 1 50
U8 1 2 Vcc Vee 2 tlv27x
Vee 0 Vee DC 1.5V
Vcc Vcc 0 DC 1.5V
.end
*****

And here is the tlv27x.inc file:

keith AT t520:~/gaf$ cat tlv27x.inc
*******************************
* Begin .SUBCKT model            *
* This is for one section of the quad TLV274, taken from the datasheet
********************************
.SUBCKT tlv27x 1 2 3 4 5
 *DEVICE=amp_tlv27x_highVdd,OP MP,NJF,INT
 * amp_tlv_27x_highVdd operational amplifier macromodel”
 * subcircuit updated using Model Editor release 9.1 on 05/15/00
 * at 14:40 Model Editor is an OrCAD product.  *
 * connections:             non-inverting input
 *                          | inverting input
 *                          | | positive power supply
 *                          | | | negative power supply
 *                          | | | | output
 *                          | | | | |
 *subckt amp_tlv27x_highVdd 1 2 3 4 5
 * *** original name above!! ***************************

            c1        11     12 457.48E−15
            c2        6      7   5.0000E−12
            css       10     99 1.1431E−12
            dc        5      53 dy
            de        54     5   dy
            dlp       90     91 dx
            dln       92     90 dx
            dp        4      3   dx
            egnd      99     0   poly(2) (3,0) (4,0) 0 .5 .5
            fb        7      99 poly(5) vb vc ve vlp vln 0 176.02E6
−1E3 1E3 180E6 −180E6
            ga       6         0     11 12 16.272E−6
            gcm      0         6     10 99 6.8698E−9
            iss      10        4     dc 1.3371E−6
            hlim     90        0     vlim 1K
            j1       11        2     10 jx1
            J2       12        1     10 jx2
            r2       6         9     100.00E3
            rd1      3         11    61.456E3
            rd2      3         12    61.456E3
            ro1      8         5     10
            ro2      7         99    10
            rp       3         4     150.51E3
            rss      10        99    149.58E6
            vb       9         0     dc 0
            vc       3         53    dc .78905
            ve       54        4     dc .78905
            vlim     7         8     dc 0
            vlp      91        0     dc 14.200
            vln      0         92    dc 14.200
            .model   dx        D(Is=800.00E−18)
            .model   dy        D(Is=800.00E−18 Rs=1m Cjo=10p)
            .model   jx1       NJF(Is=500.00E−15
Beta=198.03E−6 Vto=−1)
            .model   jx2       NJF(Is=500.00E−15
Beta=198.03E−6 Vto=−1)
            .ends
keith AT t520:~/gaf$

********************************************************************

In case it is useful, here is a link to the tlv27x.inc file:

http://www.strucktower.com/tlv27x.inc

I have been using John Doty's excellent and helpful page on Simple,
Generic Opamp Models
(http://www.gedasymbols.org/user/john_doty/models/opamp/index.html) as an
example of how to go about this, but somehow I guess I am missing
something important. I've tried it different ways with the same results.

Ideas? I running the gEDA software under Linux Debian.

Thanks for any help you can offer,
Keith Ostertag

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