Oscillation of RC power clamp inside IC package

RC-type active clamp would be triggered by a certain dimension of steep voltage edge between power node and ground due to EM noise or ESD event even in operating state. Though this itself is decent, one trigger could lead to continuous oscillation when it comes to some clamp types of RC with multiple-stage inverters. It won't happen even with multiple-stages if the clamp is not triggered, but principle solution of this is adopting 1-stage inverter. Transient behaviors of clamps with multiple-stage inverters and one with 1-stage-inverter after triggering are discussed.