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Message
From: Shawn Tan Ser Ngiap<shawn.tan@a...>
Date: Thu Jan 13 01:27:20 CET 2005
Subject: [oc] Choosing a Fabrication Process
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..
> > - Does it matter if a design is fully digital/fully analog/mixed??
> characterized and less expensive to fix if you screw up.
Okay.. I understand this.. Use a well understood process with good device
models instead of a newer one with weaker models.. Better simulation
results, less chance of screwing up and wasting $$$ on a botched run..
> > - Does power (W) and supply (V) come into the picture??
> The max and min voltages go down as your feature size gets smaller, so yes.
Understood..
> > - Does speed (MHz/GHz) come into the picture??
> Smaller processes are faster.
Understood..
> > - Any other things to consider??
> Depending on how much analog logic you have, consider doing your
> design in an FPGA and doing an FPGA->ASIC conversion through Orbit or
Unfortunately, my design is almost certainly 80%-100% analog... Does anyone
happen to know if FPAAs are as useful as FPGAs in circuit development?? I've
never used FPAA..
> > I'm about to go down the full-custom analogue/mixed path and I'd like to
> Honestly, I'm not trying to put a downer on things, but if you're
> seriously going to design a full-custom chip, you shouldn't be asking
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..
cheers..
--
with metta,
Shawn Tan
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