An electrostatic discharge (ESD) protection circuit formed on a semiconductor substrate includes a first stage clamping circuit and a second stage clamping circuit separated by a dissipative circuit. The first and second stage clamping circuits are designed to absorb and dissipate the high and low energy...http://www.google.fr/patents/US5521783?utm_source=gb-gplus-shareBrevet US5521783 - Electrostatic discharge protection circuit
