What waveform viewer are you using?  Are you using ADE?  Can you see a results directory created by Spectre?

After simulation, or even during, go to Results->Select and schematic should be one of the options. Sometimes the direct plot form doesn't load the results.

Your simulation directory is set from ADE->Setup->Simulator/Directory/Host or from the environment variable (in .cdsenv not in your path!)

asimenv.startup projectDir string "/some_folder"

Then your results are saved in /some_folder/cellname/spectre/psf

Don't mean to sound insulting, but did you actually *run* the simulation? You don't have a spectre.out file (output log) in your .../spectre/psf folder.

apprentice wrote on May 8^th, 2009, 8:44pm:


You don't have to edit .cdsenv, you can set the project directory in ADE as I mentioned previously (Setup->Simulator/Directory/Host). In my case, I have all my results stored in /opt/simulation/ and when I run simulation using lnaSimple (for example), spectre will create the results folders in /opt/simulation/lnaSimple/... So you just have to specify the base directory of the simulation results.

Also are you setting your environment to append the .cdsenv file upon exit? you have alot of duplicate entries which can cause confusion when loading icfb. If asimenv.startup projectDir is not defined, spectre will use the default location which i believe is $PWD/simulation. You can refer to ../IC/doc/anasimhelp/anasimhelp.pdf for information about this and other analog environment variables that can be set in .cdsenv.

apprentice wrote on May 8^th, 2009, 8:44pm:


Firstly, what type of analysis have you set up? If your analysis pane is empty then no wonder you aren't getting results. Please attach your input.scs file from /simulation/lnaSimple/spectre/schematic/netlist folder. After hitting netlist and run, do you get warnings or errors in icfb? What is cadence doing during that one minute?

apprentice wrote on May 8^th, 2009, 8:44pm:


cds_root will find the path to the argument. since icfb and icms are in the same folder (.../IC/tools/dfII/bin) it shouldn't matter. Also be sure to use ` and not ' around the command. rfExamples folder should be set in cds.lib not as an environment variable unless your cds.lib has something along the lines of DEFINE rfExamples $CDS_rfExamples. Simpler way is to add this line to cds.lib (some useful example directories)

#EXAMPLE LIBRARIES
DEFINE US_10ths $CDS_HOME/tools/dfII/samples/cdslib/sheets/US_10ths
DEFINE rfLib $CDS_HOME/tools/dfII/samples/artist/rfLib
DEFINE rfExamples $CDS_HOME/tools/dfII/samples/artist/rfExamples
DEFINE pllMMLib $CDS_HOME/tools/dfII/samples/artist/pllMMLib
DEFINE pllLib $CDS_HOME/tools/dfII/samples/artist/pllLib
DEFINE passiveLib $CDS_HOME/tools/dfII/samples/artist/passiveLib
DEFINE bmslib $CDS_HOME/tools/dfII/samples/artist/bmslib
DEFINE ahdlLib $CDS_HOME/tools/dfII/samples/artist/ahdlLib
DEFINE aExamples $CDS_HOME/tools/dfII/samples/artist/aExamples
DEFINE avTech $CDS_TOP_DIR/ASSURA/tools/assura/etc/avtech/avTech
DEFINE functional $CDS_HOME/tools/dfII/etc/cdslib/artist/functional

these variables, CDS_HOME and CDS_TOP_DIR are specific to my site, maybe your variables are different. CDS_HOME is the same as result of cds_root icfb. CDS_TOP_DIR is the directory where all your cadence tools are installed (i.e. CDS_HOME can also be CDS_TOP_DIR/IC and MMSIMHOME can be CDS_TOP_DIR/MMSIM, etc).


apprentice wrote on May 8^th, 2009, 8:44pm:


in .cshrc, try:

setenv PATH $PATH:$MMSIMHOME/tools/bin:$MMSIMHOME/tools/dfII/bin:$CDSHOME/tools/bin:$CDSHOME
/tools/dfII/bin:$CDSHOME/tools/java:$CDSHOME/tools/java/bin

be sure to define MMSIMHOME and CDSHOME before defining PATH

apprentice wrote on May 8^th, 2009, 8:44pm:


are you using .cshrc designed for the same version of IC that you are using?

apprentice wrote on May 7^th, 2009, 7:37pm:
Show me the followings.

(1) Result of "ADE>Setup>Simulator/Directory/Host"
(2) Complete netlist("input.scs") which you can show and save it by "ADE>Simulation>Netlist>Display".
(3) Complete log file("spectre.out") which you can show and save it by "ADE>Simulation>Output Log".

3) screenshot

apprentice wrote on May 8^th, 2009, 9:39pm:


Sorry my syntax was also wrong, i was mixing zsh and csh syntax. Refer http://root.cern.ch/root/EnvVars.html. So you should be using

set path = ( $path $MMSIMHOME/tools/bin $MMSIMHOME/tools/dfII/bin $CDSHOME/tools/bin:$CDSHOME/tools/dfII/bin $CDSHOME/tools/java $CDSHOME/tools/java/bin ) as before. Make sure everything is on a single line. You don't set MMSIMHOME or CDSHOME in you .cshrc, are you running another script to set these variables, or this is just small part of your .cshrc?

pancho_hideboo wrote on May 8^th, 2009, 10:57pm:


This can also be the case if the simulation is not successful. I'm not sure why the simulation proceeds without include files. Are you using one of the gpdk's? I think alot of the appnotes are written for gpdk180, in which case you should also include its model file. If you installed the kit correctly, this should be taken care of by the .cdsenv template of the pdk, and you should set the environment variable CDS_LOAD_ENV=CWDElseHome (loads CWD/.cdsenv if it exists, or else ~/.cdsenv, if it exists). As requested, please attach your input.scs and spectre.out files.

It seems he has a model file specified, otherwise he would receive the message in output log:

Code:

Problems encountered during simulation.
Use the Simulation->Output Log menu for more information. 

I loaded the lnaSimple example and simulated using pss analysis and found no errors. I followed pancho_hideboo's instruction to load $CDS_INST_DIR/tools/dfII/samples/artist/models/spectre/rfModels.scs as the model file. I don't know which document you refered to in a previous post, but the voltage gain should be 10dB if my simulation is correct?