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rf_ray
Joined: 01 Aug 2004
Posts: 25
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 03 Aug 2004 21:52 Corner analysis in Cadence |
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| 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?
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sunking
Joined: 25 May 2004
Posts: 914
Helped: 46
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| 04 Aug 2004 1:57 Re: Corner analysis in Cadence |
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| Yes, you should write script for the corner analysis
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chun_hung86
Joined: 13 Aug 2004
Posts: 10
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| 23 Aug 2004 17:07 Corner analysis in Cadence |
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| how can i script the spice file to analyze the corner?
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micel99
Joined: 01 Apr 2004
Posts: 34
Helped: 1
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| 23 Aug 2004 20:30 Corner analysis in Cadence |
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| 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.
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nxing
Joined: 10 May 2004
Posts: 446
Helped: 13
Location: China
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| 24 Aug 2004 7:16 Corner analysis in Cadence |
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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!
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chun_hung86
Joined: 13 Aug 2004
Posts: 10
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| 24 Aug 2004 9:50 Corner analysis in Cadence |
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| Different corner have different results, but some books means must to run ff, ss.etc. So, what corner simulation is the best, and precise?
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micel99
Joined: 01 Apr 2004
Posts: 34
Helped: 1
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| 24 Aug 2004 23:04 Corner analysis in Cadence |
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| ff, ss, etc. all together are called 'corners'. The motive behind is to see how the process varieties affect on your design.
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nxing
Joined: 10 May 2004
Posts: 446
Helped: 13
Location: China
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| 25 Aug 2004 6:22 Corner analysis in Cadence |
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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.
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Question
Joined: 11 Aug 2004
Posts: 76
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| 25 Aug 2004 9:50 Corner analysis in Cadence |
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| you can see the help document of design kit and model. It will tell you all type of corner you can use.
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piao
Joined: 12 Feb 2003
Posts: 223
Helped: 7
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| 25 Aug 2004 17:07 Corner analysis in Cadence |
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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!
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okguy
Joined: 01 Mar 2002
Posts: 563
Helped: 6
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| 26 Aug 2004 1:22 Re: Corner analysis in Cadence |
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| 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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layes
Joined: 27 Sep 2004
Posts: 57
Helped: 2
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| 08 Oct 2004 9:09 Re: Corner analysis in Cadence |
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ff ss tt
temprature
power supply
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