'' exception caught '' error when doing DRC for mocmos technology

[Yaqub Mahnashi]

Hi,

I got the ''exception caught'' error quite frequently when I do DRC for layout only (please check below).  I checked the memory allocated in the preferences as suggested by Dr. Baker and it was set to 1024 MB so it should be enough. 

Can you please give some hints what generate this error and how it can be resolved?

-------------------------------------------------------------------------------------------------------

--------------------------- Electric messages -------------------------------

Running DRC with area bit on, extension bit on, Mosis bit

Checking again hierarchy .... (0.0 secs)

Found 6 networks

Checking cell 'CS_Amp{lay}'

java.lang.AssertionError

at com.sun.electric.tool.drc.Quick$QuickAreaEnumeratorLocal.visitNodeInst(Quick.java:4838)

at com.sun.electric.database.hierarchy.HierarchyEnumerator.visitThisNode(HierarchyEnumerator.java:351)

at com.sun.electric.database.hierarchy.HierarchyEnumerator.enumerateCell(HierarchyEnumerator.java:333)

at com.sun.electric.database.hierarchy.HierarchyEnumerator.doIt(HierarchyEnumerator.java:383)

at com.sun.electric.database.hierarchy.HierarchyEnumerator.enumerateCell(HierarchyEnumerator.java:936)

at com.sun.electric.database.hierarchy.HierarchyEnumerator.enumerateCell(HierarchyEnumerator.java:930)

at com.sun.electric.database.hierarchy.HierarchyEnumerator.enumerateCell(HierarchyEnumerator.java:926)

at com.sun.electric.database.hierarchy.HierarchyEnumerator.enumerateCell(HierarchyEnumerator.java:918)

at com.sun.electric.tool.drc.Quick.checkMinAreaSlow(Quick.java:2618)

at com.sun.electric.tool.drc.Quick.checkThisCell(Quick.java:500)

at com.sun.electric.tool.drc.Quick.doCheck(Quick.java:339)

at com.sun.electric.tool.drc.Quick.checkDesignRules(Quick.java:157)

at com.sun.electric.tool.drc.DRC$CheckDRCHierarchically.doIt(DRC.java:1476)

at com.sun.electric.tool.EThread.run(EThread.java:114)

[Patrick Mendes]

Hello Yaqub, I am no expert on Java errors, but I could at least test your library to check if it is reproducible around here. I think it's important that you provide your installed JRE version and the OS. I could test your library on Windows 8.1 and 10 and Fedora. It's just the DRC that is giving you headaches?

Best regards, Patrick.

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[Yaqub Mahnashi]

thanks Patrick, 

Yes, it is only the DRC for layout that generates this ''exception caught'' error. DRC works fine with schematic.

I am using JRE v1.8.0 along with Java3D v1.5.1 to see the 3D view, and windows 10.

Attached is the jelib library that has a simple common-source amplifier, even with this simple layout I got the same error.

Regards,

Yaqub

[R K Tiwary]

Can some one suggest free tool for simulation of  RF Microelectronis circuit ? 

Sent from my iPhone

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<test1.rar>

[Patrick Mendes]

Hello Yaqub, I've tested your library here and I've got no errors from neither Java nor Electric. That is, the DRC ran completely without errors and there were no errors in your layout so far.

I've run it on Windows 8.1, Electric 9.07, and the Java (Oracle) version installed is:

java version "1.8.0_261"
Java(TM) SE Runtime Environment (build 1.8.0_261-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.261-b12, mixed mode)

I don't think this could be an issue with Java 3D, but I'm far from being an expert. Mine is 1.5.2. It seems that the Java versions are the same, but check the exact one by typing: java -version in a command prompt window. 

I hope you can solve it. 

Best regards, Patrick.

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[Patrick Mendes]

The only one I have heard about is HSpice RF module (paid), but I don't know the specifics of it to point to you this or that simulator for doing the analyses you're looking for. The best free ones I can point out are NGSpice and Spice Opus. Don't know the difference between them, but I've seen papers written with the support of Spice Opus. It must have its value.

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[Vikas Varshney]

Hello Sir,

I found below website of much help on free tools

http://cmosedu.com/cmos1/ltspice/ltspice.htm

http://cmosedu.com/

Regards

Vikas

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[sudheer k Muhammed]

http://qucs.sourceforge.net/

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[Steven Rubin]

Okay, I've found the problem with the DRC. It is apparently unable to handle the "Scalable" transistors in the "mocmos" technology.

A fix has been checked-in to the repository, but for those unable to rebuild from sources, simply stop using those transistors (they are a special-case that was built for their ability to change size from cell parameters, something that I suspect nobody cares about). They also have Active contacts on the two ends, so when you remove them, you have to replace them with a transistor and two contacts. How hard can that be?

   -Steven Rubin

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