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Post-Layout Simulation<br />

DSPF Backannotation Examples<br />

This can also be specified by the LEVEL parameter in the .DSPF_INCLUDE command.<br />

If specified in the command it will overwrite this option.<br />

See “.OPTION DSPF_LEVEL” in the Eldo Reference Manual.<br />

• KEEP_DSPF_NODE<br />

Keeps the reference to the original node names. Eldo keeps the original .PLOT/.PROBE<br />

command if a node coming from the DSPF has the same name. It is not set by default,<br />

because this node may be completely different to the original one.<br />

See “.OPTION KEEP_DSPF_NODE” in the Eldo Reference Manual.<br />

• KEEP_DANGLING<br />

Keeps dangling objects in the Eldo database.<br />

See “.OPTION KEEPDANGLING” in the Eldo Reference Manual.<br />

• KEEP_SHORTED<br />

Keeps shorted objects in the Eldo database.<br />

See “.OPTION KEEPSHORTED” in the Eldo Reference Manual.<br />

• MAX_DSPF_PLOT<br />

Sets the maximum number of DSPF interface nodes plotted.<br />

See “.OPTION MAX_DSPF_PLOT” in the Eldo Reference Manual.<br />

Related Topics<br />

DSPF File Structure<br />

Eldo Post-Layout Commands<br />

DSPF Backannotation Examples<br />

DSPF Backannotation Examples<br />

An example showing how to import a .dspf file containing layout parasitics is provided.<br />

See “Example 21—Post-Layout Simulation using DSPF” on page 1324. Using .ALTER<br />

statements, several simulations with different degrees of backannotation can be overlapped and<br />

compared. The circuit is a 2-stage opamp, connected in follower mode.<br />

Notice the generated notes relating to the replacement of nodes in the original netlist by DSPF<br />

networks:<br />

Note 70: Node X_OPAMP1.DIFFP has been replaced by a DSPF network.<br />

Note 70: Node X_OPAMP1.DIFFN has been replaced by a DSPF network.<br />

Note 70: Node X_OPAMP1.CURMIR has been replaced by a DSPF network.<br />

396<br />

Eldo® User's Manual, 15.3

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