| Author |
Message |
Fady Atef
Joined: 09 May 2007
Posts: 11
|
 20 Aug 2008 18:38 Isolation using DNWELL |
|
|
|
hello all
I need to know the different isolation tech that can be done using the DNWELL , like Trench Isolation between RF chanel, or DNWELL under each RF channel .
which is better?and why?
thanks, and have nice day
|
|
| Back to top |
|
 |
jecyhale
Joined: 19 Feb 2008
Posts: 442
Helped: 46
Location: China
|
| 21 Aug 2008 8:45 Re: Isolation using DNWELL |
|
|
|
| Fady Atef wrote: |
hello all
I need to know the different isolation tech that can be done using the DNWELL , like Trench Isolation between RF chanel, or DNWELL under each RF channel .
which is better?and why?
thanks, and have nice day |
I think DNWELL may the best so far, because it can generate a isolated P-sub.
And it looks like a island. So all frequeny domain noise will be isolated well.
|
|
| Back to top |
|
|
Fady Atef
Joined: 09 May 2007
Posts: 11
|
| 21 Aug 2008 19:59 Re: Isolation using DNWELL |
|
|
|
| Thanks,
|
|
| Back to top |
|
|
ninge
Joined: 10 May 2006
Posts: 27
Helped: 2
Location: Bangalore
|
| 27 Aug 2008 8:58 Re: Isolation using DNWELL |
|
|
|
| Me also feel DNWELL is Better...
|
|
| Back to top |
|
|
Teddy
Joined: 15 Sep 2004
Posts: 281
Helped: 38
|
| 28 Aug 2008 1:46 Isolation using DNWELL |
|
|
|
In general you hav access to shallow trench, deep trench , deep Nwell and Nwell and P+ N+ diffs.
The deeper the barrier the better isolation. In fact the best would be if you would have EPI process with high resistive substrate. Then your Deep Nwell or deep trench would cut out the island on silicon so you would truly have a "separate" substrate for the given device. Since most of CMOS technologies do not provide high resistive substrate (quite often EPI and subst are about the same) those isolation techniques gives you some but not ideal isolation.
Deep Nwell to be really effective needs to have minimnm width == to EPI thickness.
To summarize - Deep trench #1, Deep Nwell #2 shallow trench #3
|
|
| Back to top |
|
|
Fady Atef
Joined: 09 May 2007
Posts: 11
|
| 28 Aug 2008 15:38 Re: Isolation using DNWELL |
|
|
|
yes I hav access to shallow trench, deep trench , deep Nwell and Nwell and P+ N+ diffs
At first i make the isolation using deep trench (n+, OD, Nwell, and deep Nwell ), then more than one adv. me to use Deep nwell as it make it as island,
so which is better in isolation
Added after 14 minutes:
| Teddy wrote: |
Deep Nwell to be really effective needs to have minimnm width == to EPI thickness.
To summarize - Deep trench #1, Deep Nwell #2 shallow trench #3 |
WHAT did u meen ?
|
|
| Back to top |
|
|
leo_o2
Joined: 03 Sep 2004
Posts: 330
Helped: 20
|
| 30 Aug 2008 4:51 Isolation using DNWELL |
|
|
|
| In my opinion, Deep Nw + NBL (N+ buried layer) is the best for isolation.
|
|
| Back to top |
|
|
