INTEGRATED CIRCUIT COMPRISING ANALOG AND DIGITAL SUB-CIRCUITS WITH IMPROVED OVER-VOLTAGE PROTECTION AND REDUCED SUBSTRATE -NOISE COUPLING

摘要

An integrated circuit comprising a substrate with analog and digital sub-circuits provided with different supply terminals, including Vdd and Vss supply terminals for the analog part and a Vdd supply terminal for the digital part, as well as a common substrate terminal or ground terminal. In the substrate, an element with diode function is formed between the Vdd and Vss supply terminals of an analog sub-circuit, which element with diode function comprises a cathode part connected to the Vdd supply terminal and an anode part connected to the Vss supply terminal of the relevant analog sub-circuit. The supply terminals are further connected to the substrate terminal or ground terminal via over-voltage protection circuits, said over-voltage protection circuits for the relevant analog sub-circuit being embodied so as to be active only for positive over-voltages on a supply terminal with respect to the substrate.