Triple guard ring for ESD

[deepak242003]

Why triple guardring is required for ESD transistor ?. Any supporting article will be of great help .:-o

 

[deepak242003]

Re:NPN/ Triple guard ring for ESD

Why triple guardring is required for ESD transistor ?. Any supporting article will be of great help .:-o

I meaned n type then p type and again n type. I guess N and P should be sufficient to take of majority and minority carrier injection ..

 

[erikl]

Yes, you're right. I've never used more than 2 guardrings. But I could imagine guarding a very sensitive circuit against a very interfering (switching) environment -- or the other way round -- it could have shown necessary to add a 3^rd ring.