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Re: gEDA-user: GSchem in CMOS Analog IC context?
On Mar 8, 2009, at 7:22 AM, Stuart Brorson wrote:
> Hi --
>
>> Has anyone successfully used GSchem in an CMOS analog IC context? --
>> I'm looking at a plain-vanilla +MIM TSMC CMOS process at the ~ 0.18
>> to 0.35u node. Has anyone built symbols for the typical TSMC nodes
>> (parameterized NMOS,CMOS,resistors with appropriate sheet resistance
>> and tempco)?
Dale, assuming you're using SPICE, the question is whether the
currently maintained gnetlist back end (spice-sdb) understands the
parameter names. A regular resistor symbol should work fine with the
right attributes.
So, Stuart, does spice-sdb know how to transfer attributes to
parameters in the following syntax (ngspice)?
General form:
RXXXXXXX n+ n- <value> <mname> <l=length> <w=width> <temp=val>
+ <dtemp=val> m=<val> <ac=val> <scale=val> <noisy = 0|1>
>
> Peter Kaiser in Germany has done some chip designs using gEDA. Here's
> the website he put up recording some of his tips, including some
> symbols for instantiating devices:
>
> http://www.easyasic.com/
>
> You might try contacting him in person if you have questions. His
> e-mail addr is on his website.
>
> John Doty has also done mixed-signal designs using gEDA. He has
> published papers on his work, and has written an interesting gnetlist
> back-end, all of which he has posted on his website. I didn't see any
> schematic symbols on his website, but here's a link:
>
> http://www.noqsi.com/home.html
>
> John is very active on the e-mail list, so I expect that he'll turn up
> to provide more info to you soon.
Gotta be less predictable ;-)
Dale, I've done several design variations on my delta-sigma CCD
chains using 350 nm TSMC. However, I haven't gotten into careful
modeling of the resistors. I use very few resistors in these designs,
always in noncritical places. Gains are set by capacitor ratios.
If you're interested, I've been working on symbols for professor
Ikeda's OpenIP (http://research.kek.jp/people/ikeda/openIP/). I can
send you an alpha version of that library if you wish (you get to
check them, as I've only used a subset), and I can answer specific
questions if you can't read the Japanese documentation.
John Doty Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd@xxxxxxxxx
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