Triple guard ring for ESD

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deepak242003

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

Re:NPN/ Triple guard ring for ESD

deepak242003 said:
Why triple guardring is required for ESD transistor ?. Any supporting article will be of great help .:-o
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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 ..
 

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 3rd ring.
 

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