Circuit board

A circuit board comprising:

• a circuit board body and at least one via apparatus provided on the circuit board body, wherein the via apparatus comprises a via formed on the circuit board body, a via pad surrounding the via and separately provided from the via, and an electrical conductor electrically connecting the via pad with the via,
• wherein the via apparatus provided on the circuit board body comprises a first via apparatus and a second via apparatus;
• the first via apparatus comprises a first via, a first via pad surrounding the first via and separately provided from the first via, and a first electrical conductor electrically connecting the first via pad with the first via;
• and the second via apparatus comprises a second via, a second via pad surrounding the second via and separately provided from the second via, and a second electrical conductor electrically connecting the second via pad with the second via,
• wherein the circuit board body is further provided with a first signal wire connected to the first via pad and a second signal wire connected to the second via pad, a shortest distance of a current passing through the first via pad to the first electrical conductor and then to the first via is a first distance, and a shortest distance of a current passing through the second via pad to the second electrical conductor and then to the second via is a second distance, and
• wherein the first signal wire has a length different from a length of the second signal wire, and a sum of the length of the first signal wire and the first distance is equal to a sum of the length of the second signal wire and the second distance.