Printed circuit board, printed wiring board, and differential transmission circuit

A printed circuit board, comprising:

• a first semiconductor device comprising a first signal input/output circuit and a second signal input/output circuit;
• a second semiconductor device comprising:
• a third signal input/output circuit;
• a first internal differential signal wiring formed of a pair of signal transmission lines, the first internal differential signal wiring being connected to the third signal input/output circuit;
• a fourth signal input/output circuit;
• and
• a second internal differential signal wiring formed of a pair of signal transmission lines, the second internal differential signal wiring being connected to the fourth signal input/output circuit and arranged in parallel to the first internal differential signal wiring;
• and
• a printed wiring board having the first semiconductor device and the second semiconductor device mounted thereon, the printed wiring board comprising:
• first differential signal wiring formed of a pair of signal transmission lines, the first differential signal wiring connecting the first semiconductor device and the second semiconductor device to each other;
• and
• second differential signal wiring formed of a pair of signal transmission lines, the second differential signal wiring connecting the first semiconductor device and the second semiconductor device to each other and being arranged in parallel to the first differential signal wiring,
• wherein the first differential signal wiring and the first internal differential signal wiring are connected to each other, to thereby form a pair of first differential signal transmission lines that are continuous,
• wherein the second differential signal wiring and the second internal differential signal wiring are connected to each other, to thereby form a pair of second differential signal transmission lines that are continuous,
• wherein the pair of first differential signal transmission lines are wired to have a relative arrangement in which one signal transmission line and another signal transmission line cross with each other in a region in which the first differential signal wiring and the first internal differential signal wiring are connected to each other, and
• wherein the pair of second differential signal transmission lines are wired to have a relative arrangement in which one signal transmission line and another signal transmission line cross with each other in a region in which the second differential signal wiring and the second internal differential signal wiring are connected to each other.

A printed wiring board, comprising:

• a first differential signal wiring formed of a pair of signal transmission lines, the first differential signal wiring connecting a first semiconductor device and a second semiconductor device to each other;
• and
• a second differential signal wiring formed of a pair of signal transmission lines, the second differential signal wiring connecting the first semiconductor device and the second semiconductor device to each other,
• wherein the first differential signal wiring and the second differential signal wiring are arranged in parallel to each other,
• wherein the pair of signal transmission lines forming the first differential signal wiring are wired to have a relative arrangement in which, when viewed in plan from a direction perpendicular to a surface of the printed wiring board, one signal transmission line and another signal transmission line cross with each other at least once in the first differential signal wiring in a wiring direction thereof, and
• wherein the pair of signal transmission lines forming the second differential signal wiring are wired to have a relative arrangement in which, when viewed in plan from the direction perpendicular to the surface of the printed wiring board, one signal transmission line and another signal transmission line cross with each other at least once the second differential signal wiring in a wiring direction thereof.

A differential transmission circuit, comprising:

• a first signal input/output circuit;
• a second signal input/output circuit;
• a first differential signal wiring formed of a pair of signal transmission lines, the first differential signal wiring connecting the first signal input/output circuit and the second signal input/output circuit to each other;
• and
• a second differential signal wiring formed of a pair of signal transmission lines, the second differential signal wiring connecting the first signal input/output circuit and the second signal input/output circuit to each other and being arranged in parallel to the first differential signal wiring,
• wherein the pair of signal transmission lines forming the first differential signal wiring have a relative arrangement in which one signal transmission line and another signal transmission line cross with each other at least once in the first differential signal wiring, and
• wherein the pair of signal transmission lines forming the second differential signal wiring have a relative arrangement in which one signal transmission line and another signal transmission line cross with each other at least once in the second differential signal wiring.