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Pspice to IsSpice4
Conversion
1) Look for
all resistor .MODEL lines that look like:
.MODEL <model_name> RES
....
In these lines the type of the model must be changed from
RES to R.
Convert them according to
the following rule:
Pspice
model:
.MODEL <model name> RES ....
.MODEL
RMOD RES TC1 = 0.002
IsSpice model:
.MODEL <model_name> R
....
.MODEL RMOD R TC1 =
0.002
2) Look for
all lines starting with the letter 'R'. They should look
like:
R<name> <node_1> <node_2> <model_name>
<resistance_value> ...
Here, the ordering of
the model name and resistance value must
be swapped.
The conversion rule is:
Pspice
model:
R<name> <node_1> <node_2>
<model_name> <resistance_value> ...
Rd 1
10 RMOD 1K TEMP=25
IsSpice
model:
R<name> <node_1> <node_2>
<resistance_value> <model_name> ...
Rd 1
10 1K RMOD
TEMP=25
3) Look for
.MODEL lines containing the T_MEASURED parameter:
.MODEL <model_name>
<model_type> .... T_MEASURED = <value> ....
The
T_MEASURED parameter must be renamed to
TNOM:
Pspice
model:
.MODEL <model_name> <model_type> ....
T_MEASURED = <value> ....
.MODEL DLMOD D IS =
1E-012 T_MEASURED = 25
N = 2
IsSpice
model:
.MODEL <model_name> <model_type> ....
TNOM = <value> ....
.MODEL DLMOD D IS = 1E-012
TNOM = 25 N = 2
4) Look for
.model lines containing the T_ABS parameter:
.MODEL <model_name>
<model_type> T_ABS = <temp_value> ....
The
T_ABS parameter must be renamed to
TEMP and moved to the instance line that calls
the .model.
Change the instance and the model line according to the
following rule:
Pspice
model:
<instance_name> .... <model_name>
.MODEL
<model_name> <model_type> T_ABS =
<temp_value> ....
Ddg 25 24
ddgmod
.model ddgmod d t_abs =
25 is = 1E-024 cjo = 3.97482E-010 vj =
0.289018 m = 0.284643 fc = 1E-006
IsSpice
model:
<instance_name> .... <model_name>
TEMP = <temp_value>
.MODEL <model_name>
<model_type> ....
Ddg 25 24 ddgmod
temp = 25
.model ddgmod
d is = 1E-024 cjo = 3.97482E-010 vj = 0.289018 m =
0.284643 fc = 1E-006
Note that the .MODEL
line you are looking for may occur before the instance line that addresses
it.
Netlists are insensitive to the ordering of instance and
MODEL lines.
5) Look for
.model lines containing vswitch:
.model <model_name>
vswitch ron=??? roff=??? von=??? voff=???
Change the
device type from vswitch to
sw.
Use the same RON and ROFF parameters, but
replace VON and VOFF with VT and VH calculated as
follows: |
VON=VT+VH and
VOFF=VT-VH
Therefore,
VT=(VON+VOFF)/2 and VH=VON-VT
|
Pspice
model
.model smod vswitch
ron=.1m roff=1e15 von=-1.19
voff=-1.21
IsSpice
model
.model smod sw
ron=.1m roff=1e15 vt=-1.2
vh=.01
6) Convert G
and E tables
G tables become:
Pspice model
G1
3 4 table
{v(1,2)}=(...{table values}...)
IsSpice
model
AG1 %vd(1,2) %id(3,4) tmod
.model
tmod pwl
+ fraction = FALSE,input_domain=0.0,
xy_array = [...{table values}...]
E tables become:
Pspice model
E1
3 4 table
{v(1,2)}=(...{table values}...)
IsSpice
model
AE1 %vd(1,2) %vd(3,4) tmod
.model
tmod pwl
+ fraction = FALSE,input_domain=0.0,
xy_array = [...{table values}...]
7) Convert E/G/S elements and equations to B element
equations
For E/G elements:
Pspice model
gout
101 102 VALUE={V(201,202)*i(vsense)}
etmax tmax 0 value={Tr*v(tm1) + (Ts-Tr)*v(tm2)}
IsSpice
model
Bgout 101 102 I=V(201,202)*i(vsense)
Betmax tmax 0 v={Tr}*v(tm1) + {(Ts-Tr)}*v(tm2) ; see how {}
went around Ts-Tr
- Add
B to beginning of line
- Replace
VALUE with V for e source and I for g source
- Remove
curly braces before and after expression
- Place curly braces
around one or more parameters that can be evaluated.
Be careful not to mix nodes
and parameters in expressions.
For S
elements:
Pspice
model
s1 1 2
201 0 switch
IsSpice
model
As1 1 2 201 0
switch
- Add
A to beginning of line
8) Convert IF-THEN-ELSE
syntax:
Pspice model
Format:
IF(argument,then,else)
E1 1 0 Value = { IF ( V(3) > 5, 10, 100m )
}
E1 1 0 Value = { IF ( V(3) >
5, 5, IF ( V(3) < 100m, 100m, V(3) ) ) } ;nested
if-then-else IsSpice model
|
Format: |
EVALUATION ? OUTPUT_VALUE1 or EXPRESSION
: OUTPUT_VALUE2 or
EXPRESSION |
| |
if EVALUATION is true
then
OUTPUT_VALUE1
else
OUTPUT_VALUE2 |
BE1 1 0 V = V(3) > 5 ? 10 : 100m
BE1 1 0 V = V(3) > 5 ? 5 : V(3) < 100m ? 100m : V(3) ;nested
if-then-else
9) Analog
Behavioral In-line Equations, Expressions, and
Functions:
Note: IsSpice4 uses B-elements and Pspice uses G-element or
E-elements with keyword Value=. See item 7 above. This is only a list of
Pspice syntax and the IsSpice4 equivalent. IsSpice has a lot more
functions which you can read about in the IsSpice4 User's Guide. To make
it easier to read I highlight in red what is different or not
supported.
| |
Pspice syntax |
IsSpice syntax |
| addition |
+ |
+ |
| subtraction |
- |
- |
| multiplication |
* |
* |
| division |
/ |
/ |
| exponentiation |
** |
^ |
| unary NOT |
~ |
~ |
| boolean OR |
| |
| |
| boolean XOR |
^ |
---not supported--- |
| boolean AND |
& |
& |
| equality test |
== |
---not
supported--- |
| non-equality test |
!= |
---not supported--- |
| greater than test |
> |
> |
| greater than or equal to test |
>= |
>= |
| less than test |
< |
< |
| less than or equal to test |
<= |
<= |
| |x| |
ABS(x) |
ABS(x) |
| x1/2 |
SQRT(x) |
SQRT(x) |
| ex |
EXP(x) |
EXP(x) |
| ln(x) |
LOG(x) |
ln(x) |
| log(x) |
LOG10(x) |
log(x)
log10(x) |
| |x|y |
PWR(x,y) |
PWR(x,y) |
+|x|y (if x > 0)
-|x|y (if x < 0)
|
PWRS(x,y) |
PWRS(x,y) |
| sin(x) |
SIN(x) |
SIN(x) |
| sin-1(x) |
ASIN(x) |
ASIN(x) |
| sinh(x) |
SINH(x) |
SINH(x) |
| cos(x) |
COS(x) |
COS(x) |
| cos-1(x) |
ACOS(x) |
ACOS(x) |
| cosh(x) |
COSH(x) |
COSH(x) |
| tan(x) |
TAN(x) |
TAN(x) |
| tan-1(x) |
ATAN(x)
ARCTAN(x) |
ATAN(x) |
| tan-1(y/x) |
ATAN2(y,x) |
ATAN2(y,x) |
| tanh(x) |
TANH(x) |
TANH(x) |
| magnitude of x |
M(x) |
M(x)
mag(x)
magnitude(x) |
| phase of x |
P(x) |
P(x)
ph(x)
phase(x) |
| real part of x |
R(x) |
R(x)
re(x)
real(x) |
| imaginary part of x |
IMG(x) |
IMG(x)
im(x)
imag(x) |
| time derivative of x |
DDT(x) |
---not supported--- |
| time integral of x |
SDT(x) |
---not supported--- |
| y value as a function of x |
TABLE(x,x1,y1,...) |
Use Code Model (See item 6 above)
|
| minimum of x and y |
MIN(x,y) |
MIN(x,y) |
| maximum of x and y |
MAX(x,y) |
MAX(x,y) |
| limit (x,min,max) |
LIMIT(x,min,max) |
---not supported--- |
+1 if x > 0
0 if x = 0
-1 if x < 0 |
SGN(x) |
SGN(x) |
1 if x > 0
0 otherwise |
STP(x) |
STP(x) |
x if t is true
y otherwise
|
IF(t,x,y) |
t ? x : y |
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