Static Always Conducting NMOSFET Check (static_nmosvgs)
Description
Reports NMOS devices potentially always conducting due to connectivity problems.
The following conditions are checked, and an error is reported if they are fulfilled: NMOS: min(Vg) > min (Vs/Vd) + abs(vt)
The results are written to the static.xml file, which can be viewed in a Web browser. This check is supported only by XPS and APS.
Syntax
Name static_nmosvgs parameter=value ...
Parameters
Design check parameters
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model
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[...]
|
MOSFET device model names to be checked.
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|
vt
|
0.0 V
|
MOSFET voltage threshold. Default is 0.0 V.
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|
rpt_node
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no
|
report node voltages.Possible values are no, all, top and selected.
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Digitize parameters
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vpth
|
-0.4 V
|
PMOS threshold voltage. This value is used to calculate the voltage drop across a PMOS channel during voltage propagation. Default is -0.4 V.
|
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vnth
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0.5 V
|
NMOS threshold voltage. This value is used to calculate the voltage drop across a NMOS channel during voltage propagation. Default is 0.5 V.
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|
pwl_time
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infinity
|
Time for pwl src to be considered as constant vsrc.
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vsrcnodefile
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[...]
|
Defines file from which node voltages are read for performing the check.
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Filtering parameters
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error_limit
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10000
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Maximum number of errors reported. Default is 10000.
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Wildcard scoping
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inst
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[...]
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Subcircuit instances to which the check is applied. Default includes all instances (inst=*).
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xinst
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[...]
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Subcircuit instances to be excluded from the check. Default is none.
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subckt
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[...]
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The instances of the specified subcircuit to which the check is applied. Default includes all subcircuits (subckt=*).
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xsubckt
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[...]
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The instances of the specified subcircuits that are excluded from the check. Default is none.
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|
depth
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8
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Hierarchy levels (starting from top, instance, or subcircuit scope) to be checked. Default is 8.
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Related Topics
Static Always Conducting NMOS/PMOS Check
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