Detailed description of the Deep N well

[yaasi]

I would like to know about the Deep N-well.
Can anyone help me?


Thanks in advance.

Regards,
yaasi

 

[hackjiang]

Re: Deep N well

Simply speaking, use another n well implant between NMOS device and P substrate.The device has good isolation from the substrate.

 

[jing10273]

Re: Deep N well

not only for isolation,but also for noise rejecting and latch-up effect

 

[renwl]

Deep N well

Deep N-well is not another n well.
detailed explaination can refer to the document of the foundry.

 

[sminyi]

Deep N well

Good at substrate isolation at relatively low frequency!

 

[fixrouter4400]

Re: Deep N well

Hi Yaasi!

Please see the following link for more detailed explanation of DEEP NWELL.

http://www.essderc2002.deis.unibo.it/ESSDERC_web/Session_D11/D11_1.pdf

Cheers,

fixrouter4400

I would like to know about the Deep N-well.
Can anyone help me?


Thanks in advance.

Regards,
yaasi

 

[waxtomato]

Deep N well

basiclly, you can provide Pmos with different Nwell for bulk voltage, how about Nmos? With Deep newll you can do it too.
secondly, Deep Nwell can used as guardring

 

[hackjiang]

Re: Deep N well

Deep N-well is not another n well.
detailed explaination can refer to the document of the foundry.

You are right!
I mean it is another "N well implant".

Added after 3 minutes:

basiclly, you can provide Pmos with different Nwell for bulk voltage, how about Nmos? With Deep newll you can do it too.
secondly, Deep Nwell can used as guardring

In fact, NMOS with deep N well is of more reality.
It's just another N implant between substrate and the device above.
It act as an isolation layer.

 

[vijay.kumarreddy]

Re: Deep N well

Deep n-well is for the isolation. Guard rings can protect the horizantal currents but can not protect the vertical currents(which can travel deep in to the substrate and can couplr to the nearby sensitive circuits). So deep N-well can prevent vertical currents generated by the high power devices.Correct me if i'm wrong.