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Problem of Bulk-driven PMOS in the same substrate

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fasto2008

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Problem of Bulk-driven

Hello everyone
Can we drive by bulk many PMOS in the same substrate in technology CMOS ?
Thank you for your attention
 

Re: Problem of Bulk-driven

Yes you can, as long as the CMOS process is P-Substrate based with N-Well. All you need to do is create separate wells for each of your PMOS devices (keeping in mind all DRC rules).

There are a couple of disadvantages though. First one is that the area of your design is going to be much larger because the distance between the wells of your devices usually needs to be large. Second, is that if you want to design, for example, a bulk driven differential stage, you won't be able to use any techniques to minimize mismatch (like for example inter-digitated fingering) since your devices need to be isolated from each other.

Hope this helps,

diemilio
 

Re: Problem of Bulk-driven

Thanks a lot for your explain.
Really it was easy and clear but can you help me with documents.

Thanks a lot in advance for your help

best regards
 

Problem of Bulk-driven

You may find for example papers of Blalock and Allen about 1V opamp. Originally, the idea of body-driven MOSFETs in amplifiers was developed by Guzinski and Bialko, I suppose.
 

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