SPICEMOD(3ICD)

NAME
spicemod - process file for spice models

DESCRIPTION
The file spicemod contains information that is used by xspice when a SPICE circuit description is extracted from the database and when the option '-m' is used. The first part of spicemod describes how a transistor in the database should be renamed in the SPICE circuit description and with which value the (layout-specified) transistor width and length should be decreased to gain the transistor width and length that is appropriate for the SPICE model used. The second part of spicemod, (after the '%' sign) contains the information that is added after the extracted circuit description. This part may contain the transistor model descriptions. Another possibility to specify the transistor models for the circuit that is extracted from the database with xspice is by using the program putdevmod.

EXAMPLE
Below an example of a spicemod file for a NMOS process is given.

# nmos process TU Delft
nenh    nenhs   0.88e-6   0
ndep    deps    1.20e-6   0
%
* parameters for depletion NMOS  w/l = 4/4
.model deps nmos      level=2
+                     vto=-3.971     kp=31.54u      gamma=0.3642
+                     phi=0.578      pb=0.84        cgso=430p
+                     cgdo=430p      cgbo=130p      rsh=25.3
+                     cj=62u         mj=0.73        cjsw=340p
+                     mjsw=0.20      js=6.2u        tox=0.07u
+                     xj=0.35u       ld=0.605u      uo=640
+                     ucrit=5340     uexp=-0.025    utra=0
+                     xqc=0.5        fc=0.6         lambda=0.0258
+                     vmax=3.5e4     nsub=9.8e14
+                     delta=6.3
* end deps w/l = 4/4
* parameters for n_enhancement NMOS  w/l = 4/4
.model nenhs nmos     level=2
+                     vto=0.6838     kp=32u         gamma=0.2787
+                     phi=0.55       pb=0.84        cgso=440p
+                     cgdo=440p      cgbo=100p      rsh=25.3
+                     cj=62u         mj=0.73        cjsw=340p
+                     mjsw =0.20     js=6.2u        tox=0.07u
+                     xj=0.35u       ld=0.625u      uo=650
+                     ucrit=1430     uexp=0.154     utra=0
+                     xqc=0.5        fc=0.6         lambda=0.02269
+                     vmax=6e4       nsub=5.71e14
+                     delta=5.5
* end nenh w/l = 4/4
vpbulk 1 0 5V
rpbulk 1 0 100meg
vnbulk 2 0 -2.5V
rnbulk 2 0 100meg
* vdd ? 0 5V
* rgnd ? 0 1p
* rvss ? 0 1p

AUTHOR
A.J. van Genderen

SEE ALSO
spice, xspice(1ICD), putdevmod(1ICD).