Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

questions about a sturcture to avoid antenna effect in

Status
Not open for further replies.

xiaofeixia

Junior Member level 3
Joined
Jul 25, 2005
Messages
27
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,477
In the layout, every node, there are two diodes connected in series to avoid antenna, who can tell me how it works, thanks
[/img]
 

mujju433

Full Member level 3
Joined
Jun 2, 2007
Messages
174
Helped
4
Reputation
8
Reaction score
2
Trophy points
1,298
Activity points
2,293
Yes if u place the diodes wt happens is u can avoid antenna effect

the reason is simple the diodes are made from diffusion , but the poly is deposited onto wafer bfore the diffusion are implanted into the wafer.Hence the diode doesn't exist at the time the poly is fabricated on the wafer

And one more explaination is when the more charges are deposited on the metal lines which are running parallely over a long distance..If it touches the gate oxide the gate oxide will break so we will try to put a diodes in between them so that we can reduce it
How means it depends upon the max diode rating if it exceeds then only it gets discharges
We will place the layout of that which is nothng but metal and the contact...

Or we can use jogs to reduce this antenna affect


Don't forget to push help button
Bye take care
 

panyi

Junior Member level 1
Joined
Feb 15, 2007
Messages
17
Helped
1
Reputation
2
Reaction score
0
Trophy points
1,281
Activity points
1,355
Using metal jump is another way to avoid antenna effect.
Example below:

••••••••••••••••••••••••••••••short metal 3
•••••••••••••••••••••••••••••via•••••••••via
••••••••••••••••••short metal 2•••••••••••long metal 2
•••••••••••••••••via••••••••••••••••••••••••••••••••via
•••••••short metal1••••••••••••••••••••••••••••••••••long metal1
• • poly
 

carlson

Member level 3
Joined
Mar 11, 2005
Messages
61
Helped
2
Reputation
4
Reaction score
1
Trophy points
1,288
Activity points
1,695
when the voltage is very large ,the diode will reverse turn on. it discharge. so the input mos wouldn't be breakdown by the high voltage
 

piao

Full Member level 4
Joined
Feb 12, 2003
Messages
221
Helped
12
Reputation
24
Reaction score
8
Trophy points
1,298
Activity points
1,517
both of antenna diodes and using the metal jump can solve this problem.

antenna diodes is convinient when you are running the APR.
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top