Electronic circuit device having a function of inhibiting resonance in power wiring

A wiring board comprising:

• a plurality of insulating layers;
• power supply wiring layers, ground layers, and signal wiring layers, each being disposed on a respective one of said insulating layers;
• and
• a plurality of damping elements disposed at a plurality of positions between any one of said power supply wiring layers and any one of said ground layers, the damping elements being connected between said one of said power supply wiring layers and said one of said ground layers at said plurality of positions.

An electronic circuit package comprising:

• a wiring board having connection pins;
• semiconductor integrated circuits mounted on said wiring board;
• and
• a cap covering a top of said wiring board;
• wherein the wiring board includes:
• a plurality of planar power supply wires for supplying power to the semiconductor integrated circuits, the planar power wires including a pair of planar power supply wires for supplying power to the semiconductor integrated circuits at a predetermined voltage;
• and
• a plurality of damping elements disposed at a plurality of positions on the wiring board, the damping elements being connected between the pair of planar power supply wires at a plurality of positions on the pair of planar power supply wires.

An electronic circuit device having a power wiring resonance inhibition function comprising:

• a plurality of electronic circuit elements;
• a wiring board having said electronic circuit elements disposed thereon;
• and
• a plurality of damping elements disposed at a plurality of positions on the wiring board;
• wherein the wiring board includes
• a plurality of planar power supply wires for supplying power to the electronic circuit elements, and
• feeding terminals for supplying power to the planar power supply wires from an external device;
• wherein the damping elements are connected between the planar power supply wires at a plurality of positions on the plurality of planar power supply wires;
• and
• wherein said planar power supply wires and said damping elements cooperate to suppress a resonance peak of a power wiring impedance characteristic in a frequency range of 10.sup.4 Hz to 10.sup.9 Hz.