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Power clamp use for ESD. How can it become an oscillator ?

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surianova

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power clamp

hi all!

the attachment is the power clamp use for ESD. The RC constant is 1 us. The inductor is assume 1n for package model. The power suppy is ramp up from 0 to 3.3v in 1 us. But suprising the circuit oscillate as show in the attachment. My question is how this circuit can become an oscillator? And if i increase the RC constant to about 3 us, then the ocsillation disappear. How this thing happend?
 

Re: power clamp

You may want to put small nmos-half-latch at the pin in from second-stage of inverter (from left).
 

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