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From: "Shashank Chintalagiri (shashank DOT chintalagiri AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date: Fri, 1 Jul 2016 21:43:26 +0530
Message-ID: <CALT8Ef6Tqb5ySoCdbUF=AisD_wtDRQDhGTN_DdUBmapsbp7Nkw@mail.gmail.com>
Subject: [geda-user] Help with gnucap / POLY(2)
To: geda-user AT delorie DOT com
Content-Type: text/plain; charset=UTF-8
Reply-To: geda-user AT delorie DOT com

I recently began trying out simulation using gschem -> gspiceui -> gnucap.

I've been able to simulate simple circuits using transistors and RC withtout
too much trouble, though it take a fair bit of guesswork.

I've now hit a rather problematic wall, though. When trying to include
an opamp (Analog Devices OP1177), I find that the model includes
POLY(2) dependent sources which gnucap seems to not like.

Could someone point me to a reference or so which can explain how to
break down this sort of source into something that gnucap can handle?
If there is no other option, I'm ok with it reducing the accuracy of
the model.

The following are the lines I have causing trouble:

* (within) INPUT STAGE & POLE AT 100 MHZ
EOS  9  3     POLY(2)  (26, 28) (73, 98) 15E-6  1 1
* (within) COMMON-MODE GAIN NETWORK WITH ZERO AT 1 kHZ
E2  25 98      POLY(2) 1 98 2 98 0 0.28 0.28

On a side note the Analog Devices model file includes a +/- symbol in
a comment in the header which gnucap / gspiceui chokes on with a
failure to convert to unicode.

Thanks and regards,
Chintalagiri Shashank