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Hello,

I am trying to use extresist to extract a circuit that contains a
transmission gate and an "intentional" resistor constructed from a
relatively small piece of polysilicon, something like this:

     X         S'
     |         |
     |       --o--
     |      |     |
     |------       ----
     |      |     |
     R       -----
     R         |
     R         S
     |
     Y

(If you really want to know, it's meant a piece of a voltage-scaling DAC).
I am tearing my hair out trying to get "extres" to extract a netlist with
any semblance of this circuit.

What I'd like to get out of the extractor is the circuit shown in the
diagram, with "R" between terminals X and Y.  Using "extres all" I
get instead something like this:

     X         S'
     |         |
     |       --o--
     |      |     |
     |------       ----
     |      R     R
     |      R     R
     |      R     R
     |      |     |
     |       -----
     |         |
     Y         S

Looking at the documentation, I thought that "extres box" might
do the job with the box over the resistor, but this gives me no
values at all

Can anyone suggest what I'm doing wrong, or how to extract this properly?

BTW I get the same result either using Magic 7.1 or Magic 6.5.1

Thanks,

John Nestor

John Nestor, Associate Professor
Department of Electrical and Computer Engineering
Lafayette College
Easton, PA 18042
(610) 330-5411	nestorj AT lafayette DOT edu

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