Re: gEDA-user: Basic questions from a gEDA & Linux noob (from Vol 15, Issue 25)

[John Doty <jpd@xxxxxxxxxxxxx>]

On Aug 15, 2007, at 5:00 PM, Felix Fujishiro wrote:

> Message: 7
> Date: Tue, 14 Aug 2007 15:28:35 -0400
> From: al davis < ad151@xxxxxxxxxxxxxxxx>
> Subject: Re: gEDA-user: Basic questions from a gEDA & Linux noob
> To: geda-user@xxxxxxxxxxxxxx
> Message-ID: < 200708141528.35379.ad151@xxxxxxxxxxxxxxxx>
> Content-Type: text/plain;  charset="iso-8859-1"
>
> On Tuesday 14 August 2007, John Doty wrote:
> > If you're not adjusting transistor parameters much you could
> > make ? three terminal .SUBCKT models, each containing a
> > single transistor, with the substrate connected to a global
> > node. Use model-name= (and maybe file=, depending on how you
> > organize things) to associate the symbol with the subcircuit.
> > The problem here for me would be that I do mixed signal VLSI
> > and I'm often tweaking individual transistor parameters (L,
> > W, M). In the subcircuit approach, you need a different
> > subcircuit for every geometry.
>
> If you are adjusting transistor parameters, you can use gnucap.
> You can change them any time with a ".param" statement, and
> pass arguments to a .subckt.
>
>
> On second thought, I decided not to make the single transistors  
> into subcircuits, because of the syntax (names of subcircuits start  
> with an 'X' whereas names of MOS transistors start with an 'M').   
> Silly to base the decision on this, I know.
>
> If anyone can advise me on how to turn off the visibility of a pin,  
> I would greatly appreciate it!
>

I think an invisible pin would be a short-circuit hazard, even if  
possible. I suppose you could hide a pin beneath another pin, with  
the red end inward so you're unlikely to accidentally make a  
connection to it.

But I'm not sure that thrashing around to make the tool exactly fit  
your prejudices is the right way to use a tool. It seems to me better  
to just go with its logic rather than fighting it.

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd@xxxxxxxxx




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