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/ j...@noqsi.com _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user