User`s guide

13
-
16 Monte Carlo and Sensitivity/Worst-Case Analyses
To have resistors R2 and R4 use the same
tolerances as R1
1
Select R2.
2
From the Edit menu, select Model.
3
Click Change Model Reference.
4
Type
RMonte1.
5
Repeat steps 1
-4 for R4.
To assi
g
n 5% device tolerance to the resistance
multiplier for R3
1
Select R3.
2
From the Edit menu, select Model.
3
Click Edit Instance Model (Text).
4
Change the instance model name in the .MODEL statement
to
RTherm.
5
Change the R=1 line following the .MODEL statement to:
R=1 DEV=5%
6
Click OK to accept the changes.
Your schematic should look like Figure 13-7.
Fi
g
ure 13-7
Pressure Sensor Circuit with RMontel and
RTherm Model Definitions