[SI-LIST] Re: simulate isfet model using Hspice
- From: "Lynne Green" <lgreen@xxxxxxxxxxx>
- To: <roz_ar78@xxxxxxxxx>
- Date: Mon, 15 Sep 2003 18:12:43 -0400
Hello, Rozina,
The NMOS level=3D4 model equations do not contain/use these parameters.
So these "isfet" parameters will be ignored by HSPICE.
Best regards,
Lynne
Dr. Lynne Green
Senior Member of Consulting Staff
Cadence Design Systems, Inc.
"All the world's an analog stage, whereon digital plays bit parts."
Fred Field, Hughes Aircraft
------------------------------
Msg: #2 in digest
Date: Sun, 14 Sep 2003 19:07:31 -0700 (PDT)
From: "Rozina Abd. Rani" <roz_ar78@xxxxxxxxx>
Subject: [SI-LIST] simulate isfet model using Hspice
Hi,
=20
I'm new in ISFET biosensor area. I try make a simple circuit and doing
simulation to study isfet behaviour ( for ex: Ids Vs Vgs and etc.) using
T-Spice and H-spice. But, during simulation, i've got warning statements
like this:
=20
**warning** ztoxn : is not level=3D 4 model parameter
**warning** zepsox : is not level=3D 4 model parameter
**warning** zepsil : is not level=3D 4 model parameter
**warning** zph : is not level=3D 4 model parameter
**warning** zdeff : is not level=3D 4 model parameter
**warning** zerel : is not level=3D 4 model parameter
**warning** zchieo : is not level=3D 4 model parameter
**warning** zphilj : is not level=3D 4 model parameter
**warning** zscon : is not level=3D 4 model parameter
**warning** znkap : is not level=3D 4 model parameter
**warning** zakap : is not level=3D 4 model parameter
**warning** zbkap : is not level=3D 4 model parameter
**warning** znox : is not level=3D 4 model parameter
**warning** znnit : is not level=3D 4 model parameter
=20
For your information, i'm using this model for my isfet circuit (
n-channel Al2O3-gate isfet).=20
.model isfet nmos level=3D4 tox=3D100n ld=3D0.8u xj=3D2u nsub=3D2e15 =
tpg=3D1
+ uo=3D520 rd=3D85 rs=3D85 lambda=3D0.02 nss=3D3e10 =
xqc=3D1
+ is=3D1f cgso=3D40p cgdo=3D40p cgbo=3D200p cj=3D200u
+ mj=3D0.5 cjsw=3D80n mjsw=3D0.33
+ ztoxn=3D90n zepsox=3D28.7 zepsil=3D0.1
+ zph=3D7.0 zdeff=3D1e-18 zerel=3D0.205 zchieo=3D3m
+ zphilj=3D1m zscon=3D100m znkap=3D0.0 zakap=3D12.6n
+ zbkap=3D0.79n znox=3D8e14 znnit=3D0.0
=20
so, i hope anybody can help me by giving some explanation what the
problem is about or other knowledge about ISFET model. Is it true that
when we want to simulate for other pH value, we just change the value of
Zph?..am i right?...
=20
=20
rozina.
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