hi all!
I'm trying to project a cascode amplifier. 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http://www.thebags.it--out-of-date/listing/layout/01/schem.pnghere is the entire layout I designed
http://www.thebags.it--out-of-date/listing/layout/01/layout_tutto.pngand some relevant particulars:
- M1 and IN1
http://www.thebags.it--out-of-date/listing/layout/01/M1.png- connection between M1 and M0 and IN0
http://www.thebags.it--out-of-date/listing/layout/01/conn_m1_m0.png- connection between M0 and the resistance connected to vdd
http://www.thebags.it--out-of-date/listing/layout/01/resistance_m0.png(Do you think my layout should match the schematic?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:
Quote:@(#)$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:
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
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Cascode LVS seems to match but.. (Read 1967 times)