| Author |
Message |
xuel
Joined: 16 Nov 2004
Posts: 397
Helped: 11
|
 18 Dec 2006 8:16 why dont connect B S in local area? |
|
|
|
|
Why the layout on right side has better noise rejection?
And are there any other advantages or disadvantages?
|
|
| Back to top |
|
 |
renwl
Joined: 26 Apr 2004
Posts: 455
Helped: 23
Location: shanghai,china
|
| 18 Dec 2006 9:07 why dont connect B S in local area? |
|
|
|
|
| It's very strange. The layout in the right is avioded in most time. It should have worse noise performance. where does the conclusion come from?
|
|
| Back to top |
|
|
k_90
Joined: 25 Jan 2006
Posts: 116
Helped: 17
Location: Scotland,GB
|
| 18 Dec 2006 10:57 Re: why dont connect B S in local area? |
|
|
|
|
| I may have better noise reject as the metal length increases so will the resistance. I have never saw layout done like that, It would create antenna errors and use up vast amount of space not to mention the difficulty in matching devices and routing.
|
|
| Back to top |
|
|
xuel
Joined: 16 Nov 2004
Posts: 397
Helped: 11
|
| 18 Dec 2006 11:36 Re: why dont connect B S in local area? |
|
|
|
|
| renwl wrote: |
| It's very strange. The layout in the right is avioded in most time. It should have worse noise performance. where does the conclusion come from? |
It's from tsmc layout design rule. I have seen it in both 90nm and 65nm process.
|
|
| Back to top |
|
|
renwl
Joined: 26 Apr 2004
Posts: 455
Helped: 23
Location: shanghai,china
|
| 18 Dec 2006 11:59 why dont connect B S in local area? |
|
|
|
|
| I have never seen it in the 0.18um or above process. maybe it's specific to 90nm or less process. can you upload some pages on it?
|
|
| Back to top |
|
|
iclayout1001
Joined: 16 Apr 2007
Posts: 7
Helped: 1
|
| 18 Jun 2007 18:11 why dont connect B S in local area? |
|
|
|
|
Yes, I see this in the TSMC 90nm design manual.
I'd to know why, too. Can anybody help?
Thanks in advance.
|
|
| Back to top |
|
|
neo79
Joined: 25 Aug 2005
Posts: 84
Helped: 1
Location: singapore
|
| 21 Jun 2007 14:57 why dont connect B S in local area? |
|
|
|
|
| any explainations from process manual? i should explain a bit.
|
|
| Back to top |
|
|
