eldo_user

Running Parametric Analyses
.STEP Sweeping Parameters Examples
.param r1 1k
*...
.step param r1 1k 2k 1k, 2k 4k 500
• This example shows how a non-primitive parameter p1 can be specified:
.param p2=100k
.param p1=sqrt(p2)
*...
.step param p1 1k 5k 1k
• Temperature sweep:
.step temp 25 40 2
• Parameter RB of model qmod sweep:
.step qmod rb 80 110 10
• Parameter sweep:
.param p2=100k
.param p1=sqrt(p2)
. . .
.step param p2 1k 5k 1k
Sweep cannot be done on p1 because p1 is not a primitive.
• Subcircuit component sweep:
.step x1.c1 1p 10p 1p
• Conditional parameter and parameter sweep:
.param p1 = 1 p2 = 2
.param p3 = valif ( p1 > p2 , p1 + 1.5 , p2 + 1.5 )
.param p4 = eval ( p1 > p2 ? P1 + 1.5 : p2 + 1.5 )
.step param p1 list 1 2 3
The following examples further show how the .STEP command can be used to sweep
Parameters, Elements, Models, or Models attached to specific Elements:
.PARAM P1=1u
.MODEL NMOS NMOS LEVEL=1 VTO=2
M1 p1 p2 p3 p4 NMOS w=p1 l=3u
M2 p1 p2 p3 p4 NMOS w=p1 l=3u
*...
.end
After the above specification, the following four .STEP commands are valid:
.STEP P(P1) 1u 10u 1u
Parameter P1 varies from 1μ to 10μ in steps of 1μ.
Eldo® User's Manual, 15.3 293