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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:	Sat, 2 Jul 2016 04:19:02 +0530
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Subject:	Re: [geda-user] Help with gnucap / POLY(2)
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Thanks!

For clarification, though, the following replacements should work, yes?:

1.
EOS  9  3     POLY(2)  (26, 28) (73, 98) 15E-6  1 1
becomes:
VaEOS (9 101)        15e-6
EbEOS (101 102  26  28)  1
EcEOS (102 3 73 98)      1

2.
E2  25 98      POLY(2) 1 98 2 98 0 0.28 0.28
becomes:
EbE2 (25 112  1 98)  0.28
EcE2 (112 98 2 98)   0.28



On Fri, Jul 1, 2016 at 10:43 PM, al davis <ad252 AT freeelectron DOT net> wrote:
> On Fri, 1 Jul 2016 21:43:26 +0530
> "Shashank Chintalagiri (shashank DOT chintalagiri AT gmail DOT com) [via
> geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> wrote:
>
>> 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
>
>
> Well, Spice is not compatible with Spice.
>
> In this case, as I recall, that form is a proprietary extension in
> HSpice, that some others have copied.
>
> Assuming what you sent is correct, those statements are misuse of the
> POLY in the sense that there is a simple portable way to do the same
> thing.
>
> "E" is a voltage controlled voltage source.
>
> "POLY(2)" says it is a polynomial source with two inputs, each input is
> defined by two nodes.
>
> Parentheses are usually (not always) equivalent to whitespace.  It is
> common to use them to improve readability.
>
> So we have ..
> ...label "EOS"
> ...output nodes "9 3"
> ...keyword "POLY(2)"   ... in this case the parens are like letters.
> ...first input "(26, 28)"
> ...second input "(73, 98)"
> ...coefficients "15E-6 1 1"
>
> Explanation of the coefficients ....
> The poly source does out = A + B*in1 + C*in2 + D*in1*in1 + E*in1*in2 +
> F*in2*in2 + ......more stuff.
>
> In this case, we have A=15E-6 B=1 C=1 . All others = 0.
>
> So you might as well use:
> VaEOS (9 xxxx1)              15e-6
> EbEOS (xxxx1 xxxx2  26  28)  1
> EcEOS (xxxx2 3)              1
>
> That should work the same, and work with any Spice-syntax simulator.
>
>
> E2  25 98      POLY(2) 1 98 2 98 0 0.28 0.28
> The other line at first looks a little more confusing because there are
> no parentheses, but it is really the same:
> ...label "E2"
> ...output nodes "25 98"
> ...keyword "POLY(2)"   ... in this case the parens are like letters.
> ...first input "1 98"
> ...second input "2 98"
> ...coefficients "0 0.28 0.28"



-- 

Chintalagiri Shashank
Indian Institute of Technology, Kanpur

http://blog.chintal.in

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