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Full understand the role of n+, p-sub, n-, nwell, pwell

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bicave

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It;s difficult for me to realize the role of n+,n-,p+,p-, n-driff, pwell, diffusion..in MOS structure. I always confuse and get a big puzzle.

which document could I learn? or give me some short description about them.
Thanks
 

Hi,
You have to learn physics of semiconductor and layout techniques.
Try to find some usefull books in the forum 66.
bye.
 

n+ means a high N-type doping region; n- has lower doping concentration; n-diff is same as n+, it means n-type diffusion; pwell is p-type well.
 

Hi,
you should read cmos technology process (only a brief overview is needed) and it helps much
 

Hi, I recomend you to read the book 'The art of layout '
 

Briefly
n -semoconductor has primary carrier -electrons
p - semoconductor has primary carrier -holes
"+" or "-" means that in this area much more primary carriers(or less if "-" ) then in area without "+" or "-" so we can changes resistivity of materials.
Diffusion - is process for creating p,p+,n,n+ etc areas. Good analogy - spreading aerosol in the room

Pwell- diffusion of p -semi in n-substrape (most common)
Nwell -diffusion of p -doping in n-substrape
 
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i guess, bicave asked the role of these things, not the mean of these things.
I guess think like that: to make a contact you should make a p+ region (or n+, depends) in other case it would act like a Schottky junction (for example you don't conact the substrate directly)

Good idea read Art of analog layout.
 
Read "The Art of Analog Layout" by Hustings
 

some textbook about process may be helpful
 

If u dont have enough points to download the above indicated books,U can always trust and go for emule.com to get whatever book u want to..

Its a better idea to get the books soon..

Hope it will help you
 

drabos said:
i guess, bicave asked the role of these things, not the mean of these things.
I guess think like that: to make a contact you should make a p+ region (or n+, depends) in other case it would act like a Schottky junction (for example you don't conact the substrate directly)

Good idea read Art of analog layout.
Click to expand...

Why i should use p+ to connect to contact ? why I cant use p-??
 

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