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ESD in PECL output buffer

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chihyang wang

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My previous design has a pair of source follower output pins. Unfortunately it's ESD immunity in human body mode can only pass 1KV. The experiment result shows that the nmos to vcc fails. Is there any one to give me a guide .

Our design uses TSMC 0.35 polycide, and the nmos follows ESD design rule in addition that it's size is only 100um in width.
 

Can you give me the idea of the protection startegy which you have used, ie, What type of clamps and where you have place them
 

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