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  3. Displaying/printing Vth in a schematic

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Displaying/printing Vth in a schematic

jamesCR
jamesCR over 2 years ago

I'm using IC6.1.8-64b.83.  I'm opening ADE L and simulating using hspiceD Q-2020.03 linux64.

I've created a circuit using either an nmos_vtg or pmos of the same variety.  The nmos/pmos_vth that our professor gave us to use isn't working.  I've never used cadence before and what I've done to try and figure this out is that I've searched for the same thing on web.  Only thing that I have found is stuff that deals with spectre or some way to do it using scripting (which I'm very unfamiliar with).  The TA's and professor are very much disassociated from the class and are not/have not responded to this same request.

I've created my circuit, saved and checked it (I have no errors or warnings).  I launch ADE L and change my sim to hspiceD.  I load the respected model libraries.  I set up my analysis with tran and dc settings.  I plot the drain on the nmos for output.  What I get with the plot is transient response and dc response.  Both are measured in microAmps.  I've attempted to print dc operating points as well and I get a blank "Results Display Window".

I cannot find a thing on the web that pertains to items that I've mentioned here.  In the support area under RF design I went back to about page 10 without finding anything that references this.

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  • ShawnLogan
    ShawnLogan over 2 years ago

    Dear jamesCR,

    I apologize, but I;ve read your post twice now and am not sure where to start as I'm not sure what your question is. Are you asking why there is a blank display when you attempt to print the DC operating point for one of your two devices?

    A couple of comments/questions:

    1. If you have successfully be able to run an HSPICE transient and DC analysis of some time, then you must be netlisting correclty.

    2. What outputs are you saving? For the DC analysis, have you checked the "Save DC operating point" radio button on the DC analysis GUI? I have not used HSPICE with ADE-L for many years, but I think the DC analysis GUI did have this option.

    3. Have you tried to backannotate the DC operating poiints on the schematic to see if they appear?

    Shawn

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