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

On 10/8/2020 11:43 AM, sudheer k Muhammed wrote:
http://qucs.sourceforge.net/

On Thu, 8 Oct 2020 at 06:08, Patrick Mendes <[email protected] <mailto:[email protected]>> wrote:

    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.

    On Wed, Oct 7, 2020 at 11:24 AM R K Tiwary
    <[email protected]
    <mailto:[email protected]>> wrote:

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

        Sent from my iPhone

        On 07-Oct-2020, at 3:20 PM, Yaqub Mahnashi
        <[email protected] <mailto:[email protected]>> wrote:

        
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        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

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