understanding which tech lib is being used

[sinan]

I am using virtuoso to capture, and spectreS to simulate a circuit ,
but circuit does not behave much like my hand calculations, I
inspected netlist file and it seems strange

i pasted some part below, the thing is for example .MODEL commands
indicates the tox=5.8E-9 but below this parameter block there is a
second block(commented line) which I was not expecting says
tox=7.6E-9 ,(not only tox differs all parameters differ ) I only used
virtuoso and did not edit the SPICE netlist

what s that, I am simulating with nominal parameters, what does this
supposed to mean? I am accustomed to Mentor Graphics guy and i did not
exactly understand situation, any assistance will be appreciated

..MODEL d25N NMOS ( LEVEL=11 VERSION=3.1 TNOM=27 TOX=5.8E-9 XJ=1E-7
+NCH=2.3549E17 VTH0=0.4308936 K1=0.3519429 K2=0.0298493 K3=1E-3
K3B=0.0592323
+W0=1E-5 NLX=1.465901E-7 DVT0W=0 DVT1W=0 DVT2W=0 DVT0=0.0183405
+DVT1=4.897584E-3 DVT2=-2.52658000E-02 U0=455.3033362 UA=5.223592E-10
+UB=1.104713E-18 UC=3.287888E-11 VSAT=1.050993E5 A0=1.2318623
AGS=0.3043334
+B0=6.67749E-8 B1=5E-6 KETA=8.518046E-4 A1=0 A2=1 RDSW=+0.00000000E
+00
+PRWB=-1.00000000E-03 WR=1 WINT=2.126497E-9 LINT=4.393474E-9 XL=3E-8
XW=0
+DWG=-3.40903300E-09 DWB=2.794842E-9 VOFF=-1.02605400E-01
NFACTOR=0.1344887
+CIT=0 CDSC=1.527511E-3 CDSCD=0 CDSCB=0 ETA0=3.48737E-3
ETAB=4.557986E-4
+DSUB=3.045473E-3 PCLM=1.0446257 PDIBLC1=0.1441952
PDIBLC2=4.513382E-4
+PDIBLCB=-2.81675600E-05 DROUT=0.4698725 PSCBE1=1.761109E10
PSCBE2=3.772916E-9
+PVAG=0.0361824 DELTA=0.01 MOBMOD=1 PRT=0 UTE=-1.50000000E+00
+KT1=-1.10000000E-01 KT1L=0 KT2=0.022 UA1=4.31E-9 UB1=-7.61000000E-18
+UC1=-5.60000000E-11 AT=3.3E4 WL=0 WLN=1 WW=0 WWN=1 WWL=0 LL=0 LLN=1
LW=0 LWN=1
+LWL=0 CAPMOD=2 CGDO=6.27E-10 CGSO=6.27E-10 CGBO=0 CJ=1.918655E-3
PB=0.9784049
+MJ=0.4721729 CJSW=4.441595E-10 PBSW=0.9419636 MJSW=0.2871118
PVTH0=1.342985E-3
+PRDSW=-6.18357222E+01 PK2=-3.14072400E-03 WKETA=7.512693E-4
+LKETA=-6.14406200E+09 )





*NOM=27 &
*TOX=7.6E-9 &
*XJ=1.5E-7 &
*NCH=1.7E17 &
*VTH0=0.4964448 &
*K1=0.5307769 &
*K2=0.0199705 &
*K3=0.2963637 &
*K3B=0.2012165 &
*W0=2.836319E-6 &
*NLX=2.894802E-7 &
*DVT0W=0 &
*DVT1W=5.3E6 &
*DVT2W=-0.032 &
*DVT0=0.112017 &
*DVT1=0.2453972 &
*DVT2=-0.171915 &
*U0=444.9381976 &
*UA=2.921284E-10 &
*UB=1.773281E-18 &
*UC=7.067896E-11 &
*VSAT=1.130785E5 &
*A0=1.1356246 &
*AGS=0.2810374 &
*B0=2.844393E-7 &
*B1=5E-6 &
*KETA=-7.8181E-3 &
*A1=0 &
*A2=1 &
*RDSW=925.2701982 &
*PRWG=-1E-3 &
*PRWB=-1E-3 &
*WR=1 &
*WINT=7.186965E-8 &
*LINT=1.735515E-9 &
*XL=0 &
*XW=0 &
*DWG=-1.712973E-8 &
*DWB=5.851691E-9 &
*VOFF=-0.132935 &
*NFACTOR=0.5710974 &
*CIT=0 &
*CDSC=8.607229E-4 &
*CDSCD=0 &
*CDSCB=0 &
*ETA0=2.128321E-3 &
*ETAB=0 &
*DSUB=0.0257957 &
*PCLM=0.6766314 &
*PDIBLC1=1 &
*PDIBLC2=1.787424E-3 &
*PDIBLCB=0 &
*DROUT=0.7873539 &
*PSCBE1=6.973485E9 &
*PSCBE2=1.46235E-7 &
*PVAG=0.05 &
*DELTA=0.01 &
*MOBMOD=1 &
*PRT=0 &
*UTE=-1.5 &
*KT1=-0.11 &
*KT1L=0 &
*KT2=0.022 &
*UA1=4.31E-9 &
*UB1=-7.61E-18 &
*UC1=-5.6E-11 &
*AT=3.3E4 &
*WL=0 &
*WLN=1 &
*WW=0 &
*WWN=1 &
*WWL=0 &
*LL=0 &
*LLN=1 &
*LW=0 &
*LWN=1 &
*LWL=0 &
*CAPMOD=2 &
*CGDO=1.96E-10 &
*CGSO=1.96E-10 &
*CGBO=0 &
*CJ=9.276962E-4 &
*PB=0.8157962 &
*MJ=0.3557696 &
*CJSW=3.181055E-10 &
*PBSW=0.6869149 &
*MJSW=0.1 &
*PVTH0=-0.0252481 &
*PRDSW=-96.4502805 &
*PK2=-4.805372E-3 &
*WKETA=-7.643187E-4 &
*LKETA=-0.0129496 &
simulator lang= spectre
simulator lang= spice

 

[Andrew Beckett]

On Mon, 24 Sep 2007 23:19:03 -0000, sinan <seenone@gmail.com> wrote:

I am using virtuoso to capture, and spectreS to simulate a circuit ,
but circuit does not behave much like my hand calculations, I
inspected netlist file and it seems strange

i pasted some part below, the thing is for example .MODEL commands
indicates the tox=5.8E-9 but below this parameter block there is a
second block(commented line) which I was not expecting says
tox=7.6E-9 ,(not only tox differs all parameters differ ) I only used
virtuoso and did not edit the SPICE netlist

what s that, I am simulating with nominal parameters, what does this
supposed to mean? I am accustomed to Mentor Graphics guy and i did not
exactly understand situation, any assistance will be appreciated

.MODEL d25N NMOS ( LEVEL=11 VERSION=3.1 TNOM=27 TOX=5.8E-9 XJ=1E-7
+NCH=2.3549E17 VTH0=0.4308936 K1=0.3519429 K2=0.0298493 K3=1E-3
K3B=0.0592323
+W0=1E-5 NLX=1.465901E-7 DVT0W=0 DVT1W=0 DVT2W=0 DVT0=0.0183405
.... model lines snipped
+MJ=0.4721729 CJSW=4.441595E-10 PBSW=0.9419636 MJSW=0.2871118
PVTH0=1.342985E-3
+PRDSW=-6.18357222E+01 PK2=-3.14072400E-03 WKETA=7.512693E-4
+LKETA=-6.14406200E+09 )





*NOM=27 &
*TOX=7.6E-9 &
*XJ=1.5E-7 &
*NCH=1.7E17 &
.... lots of lines snipped

Well, they're just comments. So not sure why you're worrying. They look as if
they were part of a cdsSpice syntax model (& is the continuation character
in cdsSpice syntax, which is generally what an "S" interface like spectreS
would use to describe models).

Why are you using spectreS? It's been obsolete since IC443 (which was released
something like 8 years ago). The "spectre" interface is a much more direct
integration with the simulator.

Regards,

Andrew.

--
Andrew Beckett
Senior Solution Architect
Cadence Design Systems, UK.