safwatonline said:any simulatin can be run across corners , i.e. corners are just models for elements like MOSTs , BJTs, resistors ,caps.......etc behaving in a non-typical behaviour so u should be able to run them along any simulation
Do u mean that I have to run each simulation about 4 times (ff, fs, sf, ss) for every circuit containing PMOS and NMOS? and i have to change models every time? But i think this will be difficult if done manually, i.e. it should have certain way of automation! isn't it???!
safwatonline said:yes u have to do an ocean script, note also that there are more than 4 combination taking temp. and supply and corners for resistors and caps. and coils and .... there can be thousands of corners
evilguy said:So, if we want to assure our design is robust, how many corner we have to consider? is this corner analysis represent process variation in ic fabrication?
sparso said:evilguy said:So, if we want to assure our design is robust, how many corner we have to consider? is this corner analysis represent process variation in ic fabrication?
If you are doing purely digital design you can do the following as minimum number of corners:
TTT
SSS (-20% or process dependent)
FFF (+20% or process dependent)
TFS
TSF
For mixed signal stuff you need to add the I/O nMOS and pMOS to the list so it would look like:
TTTTT
SSSSS
FFFFF
TFSFS
TSFSF
TTTSS
TTTFF
Hope that helps.
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