The Rvar() function has a slightly different result depending on whether you are running In
SIMPLIS or SIMetrix mode.
Note: The RVAR() function parametrizes only the top-level circuit and lower
levels of the hierarchy remain unaffected.
Rvar() Syntax
The Rvar() function has the following
syntax:
RVAR(variable_name, value)
- The variable_name is the parameter that you want to change.
- The value argument indicates the value you want to assign to that
variable.
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Inline vs. Header Row Function
Behavior
The Var(), GlobalVar(), Rvar(), Change()
and Temp() functions behave differently depending on whether they are used inline or
in a header row.
- To use the functions inline, leave the header entry for that column empty. When
used inline, Var(), GlobalVar(), Rvar(), Change(), and Temp() perform the actions
described above.
- When used in a header row, the second argument, value, is
interpreted to be the default value for the function and is used if the test has
no value in its column.
For
example, the following testplan uses both inline and header row functions and
performs the actions listed below:
1
|
*?@ Var(MAX_Q,1n)
|
GlobalVar(VIN,12)
|
|
2
|
2n |
|
Change(U1.U3.GAIN,1) |
3
|
|
5.0 |
|
4
|
|
|
Change(I1.LOAD_RESISTANCE,2.5) |
-
The test on line 2 sets the variable MAX_Q to 2n based
on the value in line 2, column 1. Because column 2 is empty, the global
variable VIN to the default of12. The third column uses the
inline syntax, and changes the GAIN property on U1.U3 to
1.
-
The test on line 3 sets the global variable VIN to 5.0
using the value in the field, not the header entry. Column 1 is empty, and
there is a variable header entry, so the MAX_Q variable is set to the
default of 1n as defined in the header entry for the column. Note
that column 3 is empty and also has an empty header row. No action is
performed during test #3 for column #3.
-
The test on line 4 changes the LOAD_RESISTANCE property on
I1 to2.5 using the inline syntax. Because columns 1 and 2
on line 4 are empty, MAX_Q is set to 1n and VIN is
set to 12. Both are the defaults defined in the header row.
Note: In the above example, only Change() is used inline; however, you can
use Var(), Globalvar(), Rvar(), and Temp() inline as well. A schematic with
parameterization requires all parameters defined for every test, so if you use
Var(), Rvar(), or Globalvar() inline, you must ensure that all parameters are
defined for all tests, including those without the inline variable
definitions. The example uses Var() and Globalvar() as header row entries,
which in turn ensures the variable is defined for every test. The Rvar()
behavior is identical to the Var() behavior. Temp() may be used inline without
these restrictions because a default temperature is built-into the SIMetrix
simulator.
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