Integrated circuit assembly (ICA) comprising a digital and/or analog integrated circuit having a core with input and/or output pins and at least one power supply connection pad and one ground connection pad connected to chosen one of said input and/or output pins and respectively intended for being connected to a power supply connection zone and aground connection zone of a printed circuit board (PCB), characterized in that it also comprises a passive integration substrate set on top of said digital and/or analog integrated circuit and comprising:
- at least first and second input zones respectively connected to said ground and power supply connection pads to be fed with input ground and supply voltages;
- input and/or output zones connected to chosen core input and/or output pins;
- and a passive integrated circuit connected to said first and second input zones and arranged to feed said substrate input and/or output zones with chosen ground and supply voltages defined from said input ground and supply voltages.