Static NMOS Forward Bias Bulk Check (static_nmosb)
Description
Reports the NMOS devices with a forward-biased bulk condition. A violation is generated when the bulk bias voltage meets the following conditions:
- when mode = definite:
min( Vb ) >= min( Vd, Vs ) + abs( vt )
- when mode = possible:
max( Vb ) >= min( Vd, Vs ) + 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_nmosb parameter=value ...
Parameters
Design check parameters
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model
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[...]
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MOSFET device model names to be checked.
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rpt_node
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no
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report node voltages.Possible values are no, all, top and selected.
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mode
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definite
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Mode possible will report all possible violations. Mode definite will report definite violations. Default is definite.Possible values are definite and possible.
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vt
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0.3 V
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Threshold for p-n junction being checked. Default is 0.3V.
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Digitize parameters
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vpth
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-0.4 V
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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
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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
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Time for pwl src to be considered as constant vsrc.
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vsrcnodefile
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[...]
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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 NMOS/PMOS Forward Bias Bulk Check
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