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Corner analysis in Cadence

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rf_ray

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corner analysis

Hi all I am looking for a turorial for conduction corner analysis in cadence. I use tsmc 0.25 process. Design kit have been installed. It seems I have to write some script to do corner analysis, is it true?
 

Yes, you should write script for the corner analysis
 

how can i script the spice file to analyze the corner?
 

I don't think you need to 'write' a script to run the corners analysis. All parameters can be set in the window. First of all, you have to choose a process, then set some parameters, such as temp... The help may be the best instruction. To save settings as a script just makes your latter work easier.
 

When you fill the "model Libraries" in setup, you can specify the "sector" as typical, ff ,ss, etc to run the corner simulation.

Good Luck!
 

Different corner have different results, but some books means must to run ff, ss.etc. So, what corner simulation is the best, and precise?
 

ff, ss, etc. all together are called 'corners'. The motive behind is to see how the process varieties affect on your design.
 

It's nothing about which corner simulation is best and precise. Lice micel99 said, there are several sceniro for corner simulation, they are: typical, ff, ss, fs and sf. Usually, we simulate the circuit with typical. However, considering the process variation during fabrication, you'd better run all of them befroe you submit your design.

Hope it's clear.
 

you can see the help document of design kit and model. It will tell you all type of corner you can use.
 

I could remember in cadence's own help, there is a tutorial to write a script called OCEANS or something like this to run the corner simulation. you can find it in CAdence help document or find in the cadence tutorial path manually.

Good luck!
 

I remind you that corners include temperature range (see your spec.), voltage (usually +/-10% + IR drop), ss=Nslow-Pslow, ff=Nfast-Pfast, fs and sf. And all combinations ...
 

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