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Layout Matching Problem

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ryusgnal

ryusgnal

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Base on note above, current should run in same direction. Is this still matter if I do multifinger and common centroid layout?
 

Of course, it does matter. Because the above rule is one of many rules that you should satisfy to have a good matching. Common centroid is in addition to the above rule and it is for eliminating first-order temprature and process variation across the wafer.

OpAmp
 

OpAmp said:
Of course, it does matter. Because the above rule is one of many rules that you should satisfy to have a good matching. Common centroid is in addition to the above rule and it is for eliminating first-order temprature and process variation across the wafer.

OpAmp
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If I want to arrange my differential pair transistor as above, I have to discontinue the active for each block. Because if i don't do that, the current will flow in opposite direction each other. Am I Right?

Added after 2 minutes:

hung_wai_ming(at)hotmail.com said:
Can u post the whole lecture here?
Click to expand...
 

another layout matching technique is network layout matching. but it is more complicated.
 

wonbef said:
another layout matching technique is network layout matching. but it is more complicated.
Click to expand...

Dear wonbef,
Do you have any notes about network layout matching? I'm interested to know about it.
 

in the analog layout matching is very important
so thank you
 

Check the following for analog layout matching docs
 

I would prefer adding a dummy polt in between the "improved" version to improve profiling between the diffusion. also able to complete the diffusion ends with sharp changes from diffusion. I would also add dummy magnet-like POLY to improve POLY end mis-matches.
 

Can u explain what rules to be followed to obtain good matching like current for matched transistors should be in same direction and adding dummies.

Added after 1 minutes:

Also what is the reason behind the need for the current to be in the same direction?
 

hung_wai_ming(at)hotmail.com said:
I would also add dummy magnet-like POLY to improve POLY end mis-matches.
Click to expand...

Can you explain more about dummy magnet?
 

hi ryusgnal - please read post on "Matching Layout Techniques" about dummy transistor...but if hung_wai_ming can explain further the magnet-like poly the better.

cheers
 

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