Patent ID: 6459555
Filing Date: 2002-10-01
Classification: H01L

Abstract:
An integrated circuit comprising a substrate with analog and digital sub-circuits provided with different supply terminals comprising Vdd and Vss supply terminals for the analog part and a Vdd supply terminal for the digital part, and with a separate common substrate terminal or ground terminal, the supply terminals being connected to the substrate terminal or ground terminal via over-voltage protection circuits, said over-voltage protection circuits comprising a single diode formed in the substrate between the Vdd and Vss supply terminals of an analog sub-circuit, which single diode comprises a cathode part which is connected to the Vdd supply terminal and an anode part which is connected to the Vss supply terminal of the analog sub-circuit, and the over-voltage protection circuits are embodied so as to act only in the case of positive over-voltages on a supply terminal with respect to the substrate.