Electronics Forum / CAD / June 2007

hi all!
as someone of you knows, I'm trying to project a cascode amplifier by
myself. I finished the schematic and now I'm working on the layout
(never done before, God save me please..)

here is my schematic:
http://www.thebags.it/listing/layout/01/schem.png

here is the entire layout I designed
http://www.thebags.it/listing/layout/01/layout_tutto.png

and some relevant particulars:

- M1 and IN1
http://www.thebags.it/listing/layout/01/M1.png

- connection between M1 and M0 and IN0
http://www.thebags.it/listing/layout/01/conn_m1_m0.png

- connection between M0 and the resistance connected to vdd
http://www.thebags.it/listing/layout/01/resistance_m0.png

(Do you think my layout should match the schematic? take a look to the
pins ..I'm not sure they are ok)

1.: I run VRC and it sad only something about the density of my MET1 and
POLY1 areas ..I didn't care ..hope I was right

2.:Then I extracted the circuit and run LVS ..LVS does not recongnise
that I mad my MOS with 13 gates instead of one and give me some errors
about it. Then there are some errors I'm not able to understand ..here
it is:

######START

@(#)$CDS: LVS.exe version 5.1.0 07/02/2006 21:13 (cicln01) $

Command line: /nfsd/iccad/cds/ic5141b/tools/dfII/bin/32bit/LVS.exe -dir
/home/bassimat/CAD/LVS -l -s -t /home/bassimat/CAD/LVS/layout
/home/bassimat/CAD/LVS/schematic
Like matching is enabled.
Net swapping is enabled.
Using terminal names as correspondence points.

    Net-list summary for /home/bassimat/CAD/LVS/layout/netlist
       count
    6        nets
    5        terminals
    26        nmos4
    1        rpoly2

    Net-list summary for /home/bassimat/CAD/LVS/schematic/netlist
       count
    6        nets
    5        terminals
    2        nmos4
    1        rpoly2

    Terminal correspondence points
    N0        N2        IN0
    N4        N7        IN1
    N3        N6        OUT
    N2        N1        gnd!
    N1        N0        vdd!

Devices in the netlist but not in the rules:
        nmos4 pcapacitor rpoly2

    Ill-defined correspondence points.

    N0    N2  Accepted because one is a subset of the other
    N3    N6  Accepted because one is a subset of the other
    N4    N7  Accepted because one is a subset of the other
    N2    N1  Accepted because one is a subset of the other
    N2    N1  Accepted because one is a subset of the other
    N0    N2  Accepted because one is a subset of the other
    N3    N6  Accepted because one is a subset of the other
    N4    N7  Accepted because one is a subset of the other

    Device summary for layout
           bad  total
    nmos4        26     26

    Device summary for schematic
           bad  total
    nmos4         2      2

The net-lists failed to match.

                 layout  schematic
                instances
    un-matched        26    2
    rewired            0    0
    size errors        0    0
    pruned            0    0
    active            27    3
    total            27    3

                  nets
    un-matched        1    1
    merged            0    0
    pruned            0    0
    active            6    6
    total            6    6

                terminals
    un-matched        0    0
    matched but
    different type        0    0
    total            5    5

Probe files from /home/bassimat/CAD/LVS/schematic

devbad.out:
I /MN1
? Device does not cross-match.
I /MN0
? Device does not cross-match.

netbad.out:
N /net14
? Net does not cross-match. It has 2 connections.

mergenet.out:

termbad.out:

prunenet.out:

prunedev.out:

audit.out:

Probe files from /home/bassimat/CAD/LVS/layout

devbad.out:
The no. of lines exceeded than specified by the variable
lvsLimitLinesInOutFile.
To see the complete information please see the file:
/home/bassimat/CAD/LVS/layout/devbad.out

netbad.out:
N /6
? Net does not cross-match. It has 26 connections.

mergenet.out:

termbad.out:

prunenet.out:

prunedev.out:

audit.out:

######END

I run a simulation on the extracted circuit but the result is horrible
..it's another circuit :(

can give me some suggestion about my layout? am I making some big mistakes?

thank you all!

matteo