Circuit board

A circuit board comprising a stack of a first conductive layer and a second conductive layer each having electrical conductivity provided with an insulating layer having an electrical insulating property therebetween, the circuit board being provided with a semiconductor device thereon, the semiconductor device comprising a reference terminal to provide a reference potential and a non-reference terminal to output a signal, the circuit board comprising:

• a wiring member included in the first conductive layer;
• a first capacitor and a second capacitor, each of the capacitors comprising one terminal connected to the wiring member;
• a reference member included in the second conductive layer;
• a first interlayer joint to electrically connect the reference member to another terminal of the first capacitor;
• a second interlayer joint to electrically connect the reference member to another terminal of the second capacitor;
• and
• a third interlayer joint to electrically connect the reference member to the reference terminal, with the semiconductor device mounted on the circuit board, wherein
• the first capacitor extends from the wiring member to a region located on one side of the wiring member in a width direction thereof, and the second capacitor extends from the wiring member to a region located on another side of the wiring member in the width direction, and
• with the semiconductor device mounted on the circuit board,
• the non-reference terminal is electrically connected to the wiring member,
• the semiconductor device, the wiring member, the first capacitor, the first interlayer joint, the reference member, and the third interlayer joint constitute a first closed circuit, and
• the semiconductor device, the wiring member, the second capacitor, the second interlayer joint, the reference member, and the third interlayer joint constitute a second closed circuit.