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Message
From: Guy Hutchison<ghutchis@g...>
Date: Thu Jan 13 02:38:04 CET 2005
Subject: [oc] Choosing a Fabrication Process
On Thu, 13 Jan 2005 00:27:20 +0000, Shawn Tan Ser Ngiap
<shawn.tan@a...> wrote:
> Hi,
>
> Thanks for the quick reply..
>
> On Wednesday 12 January 2005 22:59, Guy Hutchison wrote:
> > Process is generally chosen on basis of price, so your perfect fab is
> > per-unit cost and power consumption, at a cost of higher NRE.
>
> So, process scaling has *no* effect on the circuit design at all?? I believe
> that process scaling will affect analog circuits.. Models change..
Process scaling does have effects on the circuit design (speed, power
consumption, capacitance, parasitics all change), but the primary
reason that people choose one process over another is price and
volume. That's another reason that analog circuits tend to be in
larger processes; analog circuits are much less complex (in terms of
transistor count) than digital designs, and are more likely to be
pad-limited instead of core-limited.
> Thanks for the advice.. I know that some of my questions were rather basic,
> cause I was trying to verify some very basic assumptions.. (; And no, it's
> not a downer.. I know that it's not going to be easy..
>
> Also, anyone know any mailing list I can subscribe to that discusses details
> of layout and other low level work for analog?? I tried analogvlsi on yahoo
> but it doesn't seem suitable..
It's a pretty select bunch of people; I'm not sure how you'd find
them. Your best references are probably going to be offline. I would
pull down the Alliance package and the Electric HDL tool, and check
for mailing lists and documentation references for them.
- Guy
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