Re: PMOS device reversed

On 3 Jan 2006 08:55:03 -0800, "QQ" <q_q_404@xxxxxxxxxxx> wrote:

>>> N+ buried layer _will_ cut the vertical beta, but I wouldn't count on
>>> it for safety.
>
>Could you please explain why does it cut the pnp?

Richer doped base _generally_ loses beta, but not always... depends on
the other doping levels.

>What risk still
>exists?

Latch-up. If your connection was an absolute necessity you could add
an N-well ring around the device tied to +VDD.

However I smell that you are using some kind of array where you don't
have the latitude afforded by a custom layout??

>
>>> Can you describe your application in more detail?
>
>I would like to but cannot because of confidentiality. Hope you will
>understand.
>
>Thanks
>qq

Well! You could hire me and I could sign an NDA ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
.

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