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Working with DC sweeps and OP

MicheleA

Hi all,

I know it's not appealing to write one's first post in an RF focused group talking about DC but please bare with me :)

I am interested in plotting some MOS DC parameters like gm, gmoverid, Cgg, gds as they vary across VGS and VDS.

Keeping VDS fixed for the moment, I would expect to be able to DC sweep VGS and get a curve of - say - gm Vs. VGS. This is not the case. I actually get only one point, which is the point corresponding to the "static" value of VGS, in the design variables list.

Of course I could set up an equation in the Calculator for the derivative of Id but I think that "somewhere" the tool should calculate those parameters for me...And also because for some trickier parameters like Cgg the whole process would be more complicated.

The alternative to that is to run a parametric analysis, but this is way less effective timewise.

 Does anybody know of a way of overcoming this?

Thank you in advance,

 Michele

Parents

  • Thanks again Andrew.

    Now I only have to make the toolbox work in the environment...Wich won't be difficult with the help of my super-duper CAD guys ;)

    Talking about Matlab, the association is with co-simulation (rhyme unintended), and then, with system level simulations. After reading your reply to another post in this forum where you mentioned the "spectreRF_workshop", I looked into it and found an high-level model of a Tx subsystem, but found not much information on the general subject of system level simulation.

    Questions:

    - how would you rate Cadence' suite "user-friendliness" to perform (and quickly setup) system-level simulations? (architecture assesment, chain analysis and the like)? In other words: how many blocks, simulation types, evaluation tools are available and easy to configure for this type of task? I would really like - if possible - to stay in Cadence for all IC related work, also for the "big picture" stages of the design.

    - based on your answer, can you suggest me which resources to read/study to learn sys level simulations in Cadence?

     Thanks (that must be the eighth time I write it today),

     Michele

Reply

  • Thanks again Andrew.

    Now I only have to make the toolbox work in the environment...Wich won't be difficult with the help of my super-duper CAD guys ;)

    Talking about Matlab, the association is with co-simulation (rhyme unintended), and then, with system level simulations. After reading your reply to another post in this forum where you mentioned the "spectreRF_workshop", I looked into it and found an high-level model of a Tx subsystem, but found not much information on the general subject of system level simulation.

    Questions:

    - how would you rate Cadence' suite "user-friendliness" to perform (and quickly setup) system-level simulations? (architecture assesment, chain analysis and the like)? In other words: how many blocks, simulation types, evaluation tools are available and easy to configure for this type of task? I would really like - if possible - to stay in Cadence for all IC related work, also for the "big picture" stages of the design.

    - based on your answer, can you suggest me which resources to read/study to learn sys level simulations in Cadence?

     Thanks (that must be the eighth time I write it today),

     Michele

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